diff --git a/lib/libbb.c b/lib/libbb.c
index 189a170..dd42e66 100644
--- a/lib/libbb.c
+++ b/lib/libbb.c
@@ -43,7 +43,7 @@
 
 char *concat_subpath_file(const char *path, const char *f)
 {
-	if (f && DOT_OR_DOTDOT(f))
+	if (DOT_OR_DOTDOT(f))
 		return NULL;
 	return concat_path_file(path, f);
 }