diff --git a/pcap-usb-linux.c b/pcap-usb-linux.c
index 3626c75..f09d1fa 100644
--- a/pcap-usb-linux.c
+++ b/pcap-usb-linux.c
@@ -228,8 +228,8 @@ usb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *u
 	* not mandatory, so does not count on it*/
 	string[ret] = 0;
 	ret = sscanf(string, "%x %d %c %c%c:%d:%d %s%n", &tag, &timestamp, &etype, 
-	&pipeid1, &pipeid2, &dev_addr, &ep_num, status, 
-	&cnt);
+		&pipeid1, &pipeid2, &dev_addr, &ep_num, status, 
+		&cnt);
 	if (ret < 8)
 	{
 		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
@@ -310,11 +310,11 @@ usb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *u
 		
 		/* try to convert to corresponding integer */
 		shdr = (pcap_usb_setup*)rawdata;
-		shdr->bmRequestType = htonl(strtol(str1, 0, 16));
-		shdr->bRequest = htonl(strtol(str2, 0, 16));
-		shdr->wValue = htonl(strtol(str3, 0, 16));
-		shdr->wIndex = htonl(strtol(str4, 0, 16));
-		shdr->wLength = htonl(strtol(str5, 0, 16));
+		shdr->bmRequestType = strtoul(str1, 0, 16);
+		shdr->bRequest = strtoul(str2, 0, 16);
+		shdr->wValue = htons(strtoul(str3, 0, 16));
+		shdr->wIndex = htons(strtoul(str4, 0, 16));
+		shdr->wLength = htons(strtoul(str5, 0, 16));
 		
 		pkth.caplen = sizeof(pcap_usb_setup);
 		rawdata += sizeof(pcap_usb_setup);
diff --git a/pcap/usb.h b/pcap/usb.h
index 950465c..e8d0b9a 100644
--- a/pcap/usb.h
+++ b/pcap/usb.h
@@ -56,12 +56,16 @@ typedef struct _usb_header {
   bpf_u_int32 setup_packet;
 } pcap_usb_header;
 
+
+/*
+ * defined in USB specification 
+ */
 typedef struct _usb_setup {
-  bpf_u_int32 bmRequestType;
-  bpf_u_int32 bRequest;
-  bpf_u_int32 wValue;
-  bpf_u_int32 wIndex;
-  bpf_u_int32 wLength;
+  u_int8_t bmRequestType;
+  u_int8_t bRequest;
+  u_int16_t wValue;
+  u_int16_t wIndex;
+  u_int16_t wLength;
 } pcap_usb_setup;
 
 #endif