diff --git a/gebs.h b/gebs.h
index 2e566fe..ae981e9 100644
--- a/gebs.h
+++ b/gebs.h
@@ -274,7 +274,7 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
 
 #define gebs_make_compile_flags(...) \
     do { \
-        if (!gebs_exists("compile_flags.txt")) { \
+        if (gebs_needs_rebuild("compile_flags.txt", __FILE__)) { \
             GEBS_LOGI("Creating compile_flags.txt\n"); \
             const char *__flags[] = { __VA_ARGS__ }; \
             FILE *__out = fopen("compile_flags.txt", "w"); \