diff --git a/src/cc65/codegen.c b/src/cc65/codegen.c
index b149b7dda..c1c6756c1 100644
--- a/src/cc65/codegen.c
+++ b/src/cc65/codegen.c
@@ -67,7 +67,7 @@
 
 /* this is a terrible hack that tries to combat the ever reoccuring issue with
    mingw and PRIXPTR */
-#defined(__MINGW64__)
+#if defined(__MINGW64__)
 #undef PRIXPTR
 #define PRIXPTR "%p"
 #endif