diff --git a/lib/libc-config.h.old b/lib/libc-config.h
index 1300c3a..7537bab 100644
--- a/lib/libc-config.h.old
+++ b/lib/libc-config.h
@@ -156,7 +156,7 @@
 #undef __warndecl
 
 /* Include our copy of glibc <sys/cdefs.h>.  */
-#include <cdefs.h>
+#include <sys/cdefs.h>
 
 /* <cdefs.h> __inline is too pessimistic for non-GCC.  */
 #undef __inline