diff --git a/headers/compatibility/bsd/stdio.h b/headers/compatibility/bsd/stdio.h
index d41e740d36..f926978ed3 100644
--- a/headers/compatibility/bsd/stdio.h
+++ b/headers/compatibility/bsd/stdio.h
@@ -10,7 +10,7 @@
 #include <features.h>
 
 
-#ifdef _DEFAULT_SOURCE
+#if defined(_DEFAULT_SOURCE) || defined(_GNU_SOURCE)
 
 
 #ifdef __cplusplus