diff --git a/mingw-w64-headers/include/psdk_inc/_ip_mreq1.h b/mingw-w64-headers/include/psdk_inc/_ip_mreq1.h
index d259bc9..5ca7bb3 100644
--- a/mingw-w64-headers/include/psdk_inc/_ip_mreq1.h
+++ b/mingw-w64-headers/include/psdk_inc/_ip_mreq1.h
@@ -9,10 +9,4 @@
 
 #include <inaddr.h>
 
-struct ip_mreq {
-	struct in_addr	imr_multiaddr;
-	struct in_addr	imr_interface;
-};
-
 #endif	/* _MINGW_IP_MREQ1_H */
-
diff --git a/mingw-w64-headers/include/ws2ipdef.h b/mingw-w64-headers/include/ws2ipdef.h
index b4d36c2..de761f5 100644
--- a/mingw-w64-headers/include/ws2ipdef.h
+++ b/mingw-w64-headers/include/ws2ipdef.h
@@ -119,6 +119,11 @@
 #define PROTECTION_LEVEL_DEFAULT ((UINT)-1)
 #endif
 
+typedef struct ip_mreq {
+  IN_ADDR imr_multiaddr;
+  IN_ADDR imr_interface;
+} IP_MREQ, *PIP_MREQ;
+
 typedef struct ipv6_mreq {
   struct in6_addr ipv6mr_multiaddr;
   unsigned int ipv6mr_interface;