diff --git a/server/TracyEvent.hpp b/server/TracyEvent.hpp
index 6e1e66d2..057ebdce 100644
--- a/server/TracyEvent.hpp
+++ b/server/TracyEvent.hpp
@@ -147,7 +147,7 @@ struct MemEvent
     uint64_t size;
     int64_t timeAlloc;
     int64_t timeFree;
-    uint64_t callstack;
+    uint32_t callstack;
     // All above is read/saved as-is.
 
     uint16_t threadAlloc;