diff --git a/zsnes/src/cfgload.asm b/zsnes/src/cfgload.asm
index d6e69d8e..8138c9e6 100644
--- a/zsnes/src/cfgload.asm
+++ b/zsnes/src/cfgload.asm
@@ -281,7 +281,7 @@ NEWSYM DOScreatenewcfg
     push ecx
     ; Save .CFG file
     mov edx,CMDLineStr
-%ifdef _GZIP__
+%ifdef __GZIP__
     mov byte[TextFile], 1
 %endif
     call Create_File