diff --git a/omvs_main.c b/omvs_main.c
index b2173a4..6ae03c5 100644
--- a/omvs_main.c
+++ b/omvs_main.c
@@ -48,15 +48,7 @@ typedef struct _OMVSEthHdr {
 } __attribute__((packed)) OMVSEthHdr;
 
 typedef struct _OMVSIPHdr {
-#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
-  guint ihl:4;
-  guint version:4;
-#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
-  guint version:4;
-  guint ihl:4;
-#else
-#error "endian error"
-#endif
+  guint8 vhl;
   guint8 tos;
   guint16 tot_len;
   guint16 id;
@@ -258,7 +250,7 @@ static gpointer _omvs_start_scan_job(gpointer data) {
       }
 
       ip = (OMVSIPHdr *)packet;
-      ip_hdr_len = ip->ihl * 4;
+      ip_hdr_len = (ip->vhl & 0x0f) * 4;
       if (caplen < ip_hdr_len) {
         continue;
       }