1 files changed, 1 insertions, 0 deletions
diff --git a/variable.c b/variable.c
index 4286f56086..fe0272d21e 100644
--- a/variable.c
+++ b/variable.c
@@ -16,6 +16,7 @@
 #include "env.h"
 #include "node.h"
 #include "st.h"
+#include "util.h"
 
 static st_table *rb_global_tbl;
 st_table *rb_class_tbl;