diff --git a/mjit.c b/mjit.c
index c3ed401139..28ad5ca917 100644
--- a/mjit.c
+++ b/mjit.c
@@ -69,6 +69,10 @@
    constraint.  So the correct version of code based on SIGCHLD and
    WNOHANG waitpid would be very complicated.  */
 
+#ifdef __sun
+#define __EXTENSIONS__ 1
+#endif
+
 #ifdef _WIN32
 #include <winsock2.h>
 #include <windows.h>
@@ -78,10 +82,6 @@
 #include <dlfcn.h>
 #endif
 
-#ifdef __sun
-#define __EXTENSIONS__ 1
-#endif
-
 #include "vm_core.h"
 #include "mjit.h"
 #include "version.h"