diff --git a/src/core/parser/parse_uri.c b/src/core/parser/parse_uri.c
index ec39ea7cf29..2c24054d2cc 100644
--- a/src/core/parser/parse_uri.c
+++ b/src/core/parser/parse_uri.c
@@ -26,6 +26,8 @@
  */
 
 
+#include <stdint.h>
+
 #include "../globals.h"
 #include "parse_uri.h"
 #include <string.h>
@@ -124,7 +126,7 @@ int parse_uri(char* buf, int len, struct sip_uri* uri)
 	char* pass;
 	int found_user;
 	int error_headers;
-	unsigned int scheme;
+	uint32_t scheme;
 	uri_type backup_urit;
 	uri_flags backup_urif;
 
@@ -386,9 +388,10 @@ int parse_uri(char* buf, int len, struct sip_uri* uri)
 	port_no=0;
 	state=URI_INIT;
 	memset(uri, 0, sizeof(struct sip_uri)); /* zero it all, just to be sure*/
-	/*look for sip:, sips: ,tel: or urn:*/
+	/*look for sip:, sips:, tel: or urn:*/
 	if (len<5) goto error_too_short;
-	scheme=buf[0]+(buf[1]<<8)+(buf[2]<<16)+(buf[3]<<24);
+	scheme=((uint32_t)buf[0]) + (((uint32_t)buf[1])<<8)
+				+ (((uint32_t)buf[2])<<16) + (((uint32_t)buf[3])<<24);
 	scheme|=0x20202020;
 	if (scheme==SIP_SCH){
 		uri->type=SIP_URI_T;