diff --git a/rubystub.c b/rubystub.c
index e7f46e78a5..75aeca1869 100644
--- a/rubystub.c
+++ b/rubystub.c
@@ -1,4 +1,5 @@
 #include "internal.h"
+#include "internal/missing.h"
 #if defined HAVE_DLADDR
 #include <dlfcn.h>
 #endif