diff --git a/client/TracyCallstack.cpp b/client/TracyCallstack.cpp
index 49f24c96..8c0c19d1 100644
--- a/client/TracyCallstack.cpp
+++ b/client/TracyCallstack.cpp
@@ -33,6 +33,7 @@ namespace tracy
 
 static inline char* CopyString( const char* src, size_t sz )
 {
+    assert( strlen( src ) == sz );
     auto dst = (char*)tracy_malloc( sz + 1 );
     memcpy( dst, src, sz );
     dst[sz] = '\0';