1 files changed, 1 insertions, 1 deletions
diff --git a/src/w_file.c b/src/w_file.c
index 61883adb..7525f203 100644
--- a/src/w_file.c
+++ b/src/w_file.c
@@ -64,7 +64,7 @@ wad_file_t *W_OpenFile(char *path)
     // directly into memory.
     //
 
-    if (M_CheckParm("-mmap") < 0)
+    if (!M_CheckParm("-mmap"))
     {
         return stdc_wad_file.OpenFile(path);
     }