diff --git a/containers/choc_Value.h b/containers/choc_Value.h
index db4c6f3..ed66604 100644
--- a/containers/choc_Value.h
+++ b/containers/choc_Value.h
@@ -2442,6 +2442,12 @@ void ValueView::serialise (OutputStream& output) const
      uint8_t* localCopy = nullptr;
 
     #if _MSC_VER
+
+     #ifdef __clang__
+      #pragma clang diagnostic push
+      #pragma clang diagnostic ignored "-Wlanguage-extension-token"
+     #endif
+
      __try
      {
          localCopy = (uint8_t*) _alloca (dataSize);
@@ -2450,6 +2456,11 @@ void ValueView::serialise (OutputStream& output) const
      {
          throwError ("Stack overflow");
      }
+
+     #ifdef __clang__
+      #pragma clang diagnostic pop
+     #endif
+
     #else
      localCopy = (uint8_t*) alloca (dataSize);
     #endif
diff --git a/math/choc_MathHelpers.h b/math/choc_MathHelpers.h
index fedcf3c..f91b195 100644
--- a/math/choc_MathHelpers.h
+++ b/math/choc_MathHelpers.h
@@ -30,7 +30,7 @@
   #pragma intrinsic (_BitScanReverse64)
  #endif
 
- #ifdef _M_X64
+ #if defined (_M_X64) && ! defined (_M_ARM64EC)
   #pragma intrinsic (_umul128)
   #define CHOC_HAS_UMUL128 1
  #endif