diff --git a/cbt.h b/cbt.h
index 75c6ed6..c2946bd 100644
--- a/cbt.h
+++ b/cbt.h
@@ -599,7 +599,7 @@ void _cbt_lib_src(struct cbt_lib *lib, ...) {
   glob_t globbuf;
 
   for (char *arg = va_arg(args, char *); arg; arg = va_arg(args, char *)) {
-    glob(arg, GLOB_APPEND | GLOB_BRACE, _cbt_globerr, &globbuf);
+    CBT_FAIL(glob(arg, GLOB_APPEND | GLOB_BRACE, _cbt_globerr, &globbuf) != 0);
   }
 
   for (size_t i = 0; i < globbuf.gl_pathc; i++) {