diff --git a/skeletons/asn_system.h b/skeletons/asn_system.h
index 6dcca0eb..f920efc9 100644
--- a/skeletons/asn_system.h
+++ b/skeletons/asn_system.h
@@ -26,6 +26,12 @@
 #define	 snprintf	_snprintf
 #define	 vsnprintf	_vsnprintf
 
+/* To avoid linking with ws2_32.lib, here's the definition of ntohl() */
+#define sys_ntohl(l)	((((l) << 24)  & 0xff000000)
+			| (((l) << 16) & 0xff0000)
+			| (((l) << 8)  & 0xff00)
+			| ((l) & 0xff))
+
 #ifdef _MSC_VER			/* MSVS.Net */
 #ifndef __cplusplus
 #define inline __inline
@@ -74,6 +80,9 @@ typedef	unsigned int	uint32_t;
 #endif	/* defined(sun) */
 #endif
 
+#include <netinet/in.h> /* for ntohl() */
+#define	sys_ntohl(foo)	ntohl(foo)
+
 #endif	/* defined(__vxworks) */
 
 #endif	/* WIN32 */
diff --git a/skeletons/constr_SET.c b/skeletons/constr_SET.c
index 2c5d5d0b..ecf56617 100644
--- a/skeletons/constr_SET.c
+++ b/skeletons/constr_SET.c
@@ -6,12 +6,6 @@
 #include <asn_internal.h>
 #include <constr_SET.h>
 
-#ifndef	WIN32
-#include <netinet/in.h>	/* for ntohl() */
-#else
-#include <winsock2.h>	/* for ntohl() */
-#endif
-
 /* Check that all the mandatory members are present */
 static int _SET_is_populated(asn_TYPE_descriptor_t *td, void *st);
 
@@ -411,7 +405,7 @@ _SET_is_populated(asn_TYPE_descriptor_t *td, void *st) {
 
 		midx = edx/(8 * sizeof(specs->_mandatory_elements[0]));
 		pres = ((unsigned int *)((char *)st+specs->pres_offset))[midx];
-		must = ntohl(specs->_mandatory_elements[midx]);
+		must = sys_ntohl(specs->_mandatory_elements[midx]);
 
 		if((pres & must) == must) {
 			/*