diff --git a/src/backend/Headless.cpp b/src/backend/Headless.cpp
index df4b312..55a8617 100644
--- a/src/backend/Headless.cpp
+++ b/src/backend/Headless.cpp
@@ -10,7 +10,7 @@ using namespace Hyprutils::Memory;
 using namespace Hyprutils::Math;
 #define SP CSharedPointer
 
-#define TIMESPEC_NSEC_PER_SEC 1000000000L
+#define TIMESPEC_NSEC_PER_SEC 1000000000LL
 
 static void timespecAddNs(timespec* pTimespec, int64_t delta) {
     int delta_ns_low = delta % TIMESPEC_NSEC_PER_SEC;