diff --git a/nbase/nbase_addrset.c b/nbase/nbase_addrset.c
index f6d529154..46fe95bbc 100644
--- a/nbase/nbase_addrset.c
+++ b/nbase/nbase_addrset.c
@@ -242,10 +242,10 @@ static void in_addr_to_octets(const struct in_addr *ia, uint8_t octets[4])
 {
     u32 hbo = ntohl(ia->s_addr);
 
-    octets[0] = (uint8_t) ((hbo & (0xFF << 24)) >> 24);
-    octets[1] = (uint8_t) ((hbo & (0xFF << 16)) >> 16);
-    octets[2] = (uint8_t) ((hbo & (0xFF << 8)) >> 8);
-    octets[3] = (uint8_t) (hbo & 0xFF);
+    octets[0] = (uint8_t) ((hbo & (0xFFU << 24)) >> 24);
+    octets[1] = (uint8_t) ((hbo & (0xFFU << 16)) >> 16);
+    octets[2] = (uint8_t) ((hbo & (0xFFU << 8)) >> 8);
+    octets[3] = (uint8_t) (hbo & 0xFFU);
 }
 
 #define BITVECTOR_BITS (sizeof(bitvector_t) * CHAR_BIT)