diff --git a/direct/src/showutil/FreezeTool.py b/direct/src/showutil/FreezeTool.py
index 2997747e3e..7786a2a0fe 100644
--- a/direct/src/showutil/FreezeTool.py
+++ b/direct/src/showutil/FreezeTool.py
@@ -454,7 +454,9 @@ extend_frozen_modules(const struct _frozen *new_modules, int new_count) {
 
 programFile = """
 #include "Python.h"
+#ifdef _WIN32
 #include "malloc.h"
+#endif
 
 %(moduleDefs)s