1 files changed, 1 insertions, 0 deletions
diff --git a/array.c b/array.c
index c58f88f66b..5fb0c64cb3 100644
--- a/array.c
+++ b/array.c
@@ -15,6 +15,7 @@
 #include "ruby/util.h"
 #include "ruby/st.h"
 #include "ruby/encoding.h"
+#include "internal.h"
 
 #ifndef ARRAY_DEBUG
 # define NDEBUG