diff --git a/r5dev/tier1/utlmemory.h b/r5dev/tier1/utlmemory.h
index 297c7cdf..d8baa356 100644
--- a/r5dev/tier1/utlmemory.h
+++ b/r5dev/tier1/utlmemory.h
@@ -703,7 +703,7 @@ inline bool CUtlMemory<T, I>::IsIdxValid(I i) const
 {
 	// GCC warns if I is an unsigned type and we do a ">= 0" against it (since the comparison is always 0).
 	// We get the warning even if we cast inside the expression. It only goes away if we assign to another variable.
-	long x = i;
+	int64 x = i;
 	return (x >= 0) && (x < m_nAllocationCount);
 }