diff --git a/nsock/src/nsock_pcap.h b/nsock/src/nsock_pcap.h
index 7f2b3c5d5..26fd49f04 100644
--- a/nsock/src/nsock_pcap.h
+++ b/nsock/src/nsock_pcap.h
@@ -140,8 +140,8 @@ typedef struct{
 
 typedef struct{
   struct timeval ts;
-  int caplen;
-  int len;
+  u32 caplen;
+  u32 len;
   const unsigned char *packet;  /* caplen bytes */
 } nsock_pcap;