diff --git a/build.gradle.kts b/build.gradle.kts
index cbfdc3a4..2570a4f9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -14,6 +14,7 @@ plugins {
     alias(libs.plugins.conventions.kover)
     alias(libs.plugins.conventions.gradle.doctor)
     alias(libs.plugins.atomicfu)
+    id("build-util")
 }
 
 configureProjectReport()
diff --git a/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/FirVersionSpecificApi.kt b/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/FirVersionSpecificApi.kt
index a892e886..9ce9d212 100644
--- a/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/FirVersionSpecificApi.kt
+++ b/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/FirVersionSpecificApi.kt
@@ -5,6 +5,8 @@
 package kotlinx.rpc.codegen
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.FirTypeRef
@@ -16,10 +18,20 @@ interface FirVersionSpecificApi {
         delegatedTypeRef: FirTypeRef? = null,
     ): FirResolvedTypeRef
 
+    fun ConeKotlinType.toClassSymbolVS(
+        session: FirSession,
+    ): FirClassSymbol<*>?
+
     var FirResolvedTypeRefBuilder.coneTypeVS: ConeKotlinType
 }
 
-fun <T> vsApi(body: FirVersionSpecificApi.() -> T) : T {
-    val klass = Class.forName("kotlinx.rpc.codegen.FirVersionSpecificApiImpl")
-    return (klass.kotlin.objectInstance as FirVersionSpecificApi).body()
+val vsApiClass by lazy {
+    runCatching {
+        Class.forName("kotlinx.rpc.codegen.FirVersionSpecificApiImpl")
+    }.getOrNull()
+}
+
+inline fun <T> vsApi(body: FirVersionSpecificApi.() -> T): T {
+    val kClass = vsApiClass?.kotlin ?: error("FirVersionSpecificApi is not present")
+    return (kClass.objectInstance as FirVersionSpecificApi).body()
 }
diff --git a/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/checkers/FirCheckedAnnotationCheckers.kt b/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/checkers/FirCheckedAnnotationCheckers.kt
index 9e04ddcd..cc798f31 100644
--- a/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/checkers/FirCheckedAnnotationCheckers.kt
+++ b/compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/checkers/FirCheckedAnnotationCheckers.kt
@@ -9,6 +9,7 @@ import kotlinx.rpc.codegen.FirRpcPredicates
 import kotlinx.rpc.codegen.checkers.FirCheckedAnnotationHelper.checkTypeArguments
 import kotlinx.rpc.codegen.checkers.diagnostics.FirRpcDiagnostics
 import kotlinx.rpc.codegen.common.RpcClassId
+import kotlinx.rpc.codegen.vsApi
 import org.jetbrains.kotlin.KtSourceElement
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
 import org.jetbrains.kotlin.diagnostics.reportOn
@@ -76,7 +77,7 @@ class FirCheckedAnnotationTypeParameterChecker(
                 ctx = ctx,
                 origin = bound,
                 originMapper = { it.coneType },
-                symbolProvider = { it.toClassSymbol(context.session) },
+                symbolProvider = { vsApi { it.toClassSymbolVS(context.session) } },
                 typeParameterSymbolsProvider = { it.typeParameterSymbols },
                 typeArgumentsProvider = { it.typeArguments.toList() },
                 typeArgumentsMapper = { it },
@@ -102,7 +103,7 @@ class FirCheckedAnnotationFirClassChecker(
                 ctx = ctx,
                 origin = superType,
                 originMapper = { it.coneType },
-                symbolProvider = { it.toClassSymbol(context.session) },
+                symbolProvider = { vsApi { it.toClassSymbolVS(context.session) } },
                 typeParameterSymbolsProvider = { it.typeParameterSymbols },
                 typeArgumentsProvider = { it.typeArguments.toList() },
                 typeArgumentsMapper = { it },
@@ -127,7 +128,7 @@ class FirCheckedAnnotationFirFunctionChecker(
                 ctx = ctx,
                 origin = valueParameter.returnTypeRef,
                 originMapper = { it.coneType },
-                symbolProvider = { it.toClassSymbol(context.session) },
+                symbolProvider = { vsApi { it.toClassSymbolVS(context.session) } },
                 typeParameterSymbolsProvider = { it.typeParameterSymbols },
                 typeArgumentsProvider = { it.typeArguments.toList() },
                 typeArgumentsMapper = { it },
@@ -172,7 +173,7 @@ object FirCheckedAnnotationHelper {
         parametersWithAnnotations.forEach { (i, annotations) ->
             val typeArgument = typeArguments[i]
             val type = typeArgumentsMapper(typeArgument)?.type
-            val classSymbol = type?.toClassSymbol(context.session)
+            val classSymbol = vsApi { type?.toClassSymbolVS(context.session) }
 
             val symbol = when {
                 classSymbol != null -> {
@@ -247,7 +248,7 @@ object FirCheckedAnnotationHelper {
                     }?.type
                 },
                 originTypeRefSource = extractedOriginSources.getOrNull(i) ?: nextOriginSource ?: originTypeRefSource,
-                symbolProvider = { it.toClassSymbol(context.session) },
+                symbolProvider = { vsApi { it.toClassSymbolVS(context.session) } },
                 typeParameterSymbolsProvider = { it.typeParameterSymbols },
                 typeArgumentsProvider = { it.typeArguments.toList() },
                 typeArgumentsMapper = { it },
@@ -283,7 +284,7 @@ object FirCheckedAnnotationHelper {
         visited: Set<FirBasedSymbol<*>> = emptySet(),
     ): List<FirClassSymbol<*>> {
         return symbol.annotations.mapNotNull {
-            it.resolvedType.toClassSymbol(session)
+            vsApi { it.resolvedType.toClassSymbolVS(session) }
         }.filter { annotation ->
             when {
                 annotation in visited -> false
@@ -328,7 +329,7 @@ object FirCheckedAnnotationHelper {
             symbol in visited -> false
             symbol.hasAnnotation(annotationId, session) -> true
             else -> symbol.annotations.any { annotation ->
-                annotation.resolvedType.toClassSymbol(session)?.let {
+                vsApi { annotation.resolvedType.toClassSymbolVS(session) }?.let {
                     hasCheckedAnnotation(session, it, annotationId, visited + symbol)
                 } == true
             }
diff --git a/compiler-plugin/compiler-plugin-k2/src/main/latest/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt b/compiler-plugin/compiler-plugin-k2/src/main/latest/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
index c0f6af8e..9b619df7 100644
--- a/compiler-plugin/compiler-plugin-k2/src/main/latest/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
+++ b/compiler-plugin/compiler-plugin-k2/src/main/latest/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
@@ -5,11 +5,14 @@
 package kotlinx.rpc.codegen
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
 import org.jetbrains.kotlin.fir.toFirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.types.builder.FirResolvedTypeRefBuilder
+import org.jetbrains.kotlin.fir.types.toClassSymbol
 
 @Suppress("unused")
 object FirVersionSpecificApiImpl : FirVersionSpecificApi {
@@ -20,6 +23,10 @@ object FirVersionSpecificApiImpl : FirVersionSpecificApi {
         return toFirResolvedTypeRef(source, delegatedTypeRef)
     }
 
+    override fun ConeKotlinType.toClassSymbolVS(session: FirSession): FirClassSymbol<*>? {
+        return toClassSymbol(session)
+    }
+
     override var FirResolvedTypeRefBuilder.coneTypeVS: ConeKotlinType
         get() = coneType
         set(value) {
diff --git a/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt b/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
index 1603e8f8..c45c4219 100644
--- a/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
+++ b/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
@@ -5,11 +5,15 @@
 package kotlinx.rpc.codegen
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
+import org.jetbrains.kotlin.fir.types.ConeClassLikeType
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.types.toFirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.builder.FirResolvedTypeRefBuilder
+import org.jetbrains.kotlin.fir.types.toClassSymbol
 
 @Suppress("unused")
 object FirVersionSpecificApiImpl : FirVersionSpecificApi {
@@ -20,6 +24,10 @@ object FirVersionSpecificApiImpl : FirVersionSpecificApi {
         return toFirResolvedTypeRef(source, delegatedTypeRef)
     }
 
+    override fun ConeKotlinType.toClassSymbolVS(session: FirSession): FirClassSymbol<*>? {
+        return (this as? ConeClassLikeType)?.toClassSymbol(session)
+    }
+
     override var FirResolvedTypeRefBuilder.coneTypeVS: ConeKotlinType
         get() = type
         set(value) {
diff --git a/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_21/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt b/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_21/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
index 989bd77e..b92a1be5 100644
--- a/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_21/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
+++ b/compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_21/kotlinx/rpc/codegen/FirVersionSpecificApiImpl.kt
@@ -5,11 +5,14 @@
 package kotlinx.rpc.codegen
 
 import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
 import org.jetbrains.kotlin.fir.toFirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
 import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.types.builder.FirResolvedTypeRefBuilder
+import org.jetbrains.kotlin.fir.types.toClassSymbol
 
 @Suppress("unused")
 object FirVersionSpecificApiImpl : FirVersionSpecificApi {
@@ -20,6 +23,10 @@ object FirVersionSpecificApiImpl : FirVersionSpecificApi {
         return toFirResolvedTypeRef(source, delegatedTypeRef)
     }
 
+    override fun ConeKotlinType.toClassSymbolVS(session: FirSession): FirClassSymbol<*>? {
+        return toClassSymbol(session)
+    }
+
     override var FirResolvedTypeRefBuilder.coneTypeVS: ConeKotlinType
         get() = type
         set(value) {