diff --git a/src/i_glob.c b/src/i_glob.c
index a0fe08da..31dbf9e1 100644
--- a/src/i_glob.c
+++ b/src/i_glob.c
@@ -234,7 +234,7 @@ static char *NextGlob(glob_t *glob)
              || !MatchesAnyGlob(de->d_name, glob));
 
     // Return the fully-qualified path, not just the bare filename.
-    return M_StringJoin(glob->directory, DIR_SEPARATOR_S, de->d_name, NULL);
+    return M_StringJoin(glob->directory, DIR_SEPARATOR_S, de->d_name);
 }
 
 static void ReadAllFilenames(glob_t *glob)