diff --git a/lang/basic/src/basic.g b/lang/basic/src/basic.g
index 4608d7860..8f74a69f7 100644
--- a/lang/basic/src/basic.g
+++ b/lang/basic/src/basic.g
@@ -87,6 +87,8 @@
 
 {
 #define YYDEBUG
+#include <stdlib.h>
+#include <stdio.h>
 #include "bem.h"
 #include "llmess.c"