diff --git a/ut_assert/src/utstubs.c b/ut_assert/src/utstubs.c
index 2e660f23a..cb3b9def1 100644
--- a/ut_assert/src/utstubs.c
+++ b/ut_assert/src/utstubs.c
@@ -599,7 +599,7 @@ const void* UT_Hook_GetArgPtr(const UT_StubContext_t *ContextPtr, const char *Na
 
     static const union
     {
-        uintmax_t AsInt;
+        unsigned long AsInt;
         void *AsPtr;
         double AsFloat;
     } ARG_DEFAULT_ZERO_VALUE = { 0 };