diff --git a/extra/resolveip.c b/extra/resolveip.c
index 133f6ddeb07..004f312dc7c 100644
--- a/extra/resolveip.c
+++ b/extra/resolveip.c
@@ -37,7 +37,7 @@ extern int h_errno;
 #endif
 
 #ifndef HAVE_IN_ADDR_T
-#define in_addr_t u_long
+#define in_addr_t ulong
 #endif