1 files changed, 2 insertions, 0 deletions

diff --git a/util.c b/util.c
index 8dea777ffa..f299c1cf04 100644
--- a/util.c
+++ b/util.c
@@ -10,6 +10,8 @@
 
 ************************************************/
 
+#include <stdio.h>
+
 #define RUBY_NO_INLINE
 #include "ruby.h"