diff --git a/iseq.c b/iseq.c
index fe3a9dfc28..89a52972d3 100644
--- a/iseq.c
+++ b/iseq.c
@@ -38,6 +38,7 @@
 #include "ruby/util.h"
 #include "vm_core.h"
 #include "vm_callinfo.h"
+#include "ujit.h"
 
 #include "builtin.h"
 #include "insns.inc"