diff --git a/config-win32.h b/config-win32.h
index b2f9cd010..d82c59e7d 100644
--- a/config-win32.h
+++ b/config-win32.h
@@ -179,6 +179,9 @@
 /* Define if you have the RAND_screen function when using SSL  */
 #define HAVE_RAND_SCREEN 1
 
+/* Define this to if in_addr_t is not an available typedefed type */
+#define in_addr_t unsigned long
+
 /*************************************************
  * This section is for compiler specific defines.*
  *************************************************/