1 files changed, 1 insertions, 0 deletions
diff --git a/marshal.c b/marshal.c
index 03537395c8..141288058b 100644
--- a/marshal.c
+++ b/marshal.c
@@ -14,6 +14,7 @@
 #include "ruby/st.h"
 #include "ruby/util.h"
 #include "ruby/encoding.h"
+#include "internal.h"
 
 #include <math.h>
 #ifdef HAVE_FLOAT_H