diff --git a/mjit.c b/mjit.c
index 826c5b3a13..c3ed401139 100644
--- a/mjit.c
+++ b/mjit.c
@@ -78,7 +78,10 @@
 #include <dlfcn.h>
 #endif
 
-#include "internal.h"
+#ifdef __sun
+#define __EXTENSIONS__ 1
+#endif
+
 #include "vm_core.h"
 #include "mjit.h"
 #include "version.h"