diff --git a/source/duke3d/src/game.cpp b/source/duke3d/src/game.cpp
index 5c7d7b8c5..698e7b54d 100644
--- a/source/duke3d/src/game.cpp
+++ b/source/duke3d/src/game.cpp
@@ -6504,7 +6504,7 @@ int app_main(int argc, char const * const * argv)
     char *const setupFileName = Xstrdup(g_setupFileName);
     char *const p             = strtok(setupFileName, ".");
 
-    if (!Bstrcmp(g_setupFileName, SETUPFILENAME))
+    if (!p || !Bstrcmp(g_setupFileName, SETUPFILENAME))
         Bsprintf(tempbuf, "settings.cfg");
     else
         Bsprintf(tempbuf, "%s_settings.cfg", p);