diff --git a/libnetutils/dhcpclient.c b/libnetutils/dhcpclient.c
index b38e258..34500e7 100644
--- a/libnetutils/dhcpclient.c
+++ b/libnetutils/dhcpclient.c
@@ -197,7 +197,11 @@
         }
         switch(opt) {
         case OPT_SUBNET_MASK:
-            if (optlen >= 4) info->prefixLength = ipv4NetmaskToPrefixLength(*((uint32_t*)x));
+            if (optlen >= 4) {
+                in_addr_t mask;
+                memcpy(&mask, x, 4);
+                info->prefixLength = ipv4NetmaskToPrefixLength(mask);
+            }
             break;
         case OPT_GATEWAY:
             if (optlen >= 4) memcpy(&info->gateway, x, 4);
diff --git a/libnetutils/ifc_utils.c b/libnetutils/ifc_utils.c
index 186b98c..f19cb41 100644
--- a/libnetutils/ifc_utils.c
+++ b/libnetutils/ifc_utils.c
@@ -75,9 +75,8 @@
 
 int ipv4NetmaskToPrefixLength(in_addr_t mask)
 {
-    mask = ntohl(mask);
     int prefixLength = 0;
-    uint32_t m = (uint32_t)mask;
+    uint32_t m = (uint32_t)ntohl(mask);
     while (m & 0x80000000) {
         prefixLength++;
         m = m << 1;
@@ -486,7 +485,7 @@
         if(ioctl(ifc_ctl_sock, SIOCGIFNETMASK, &ifr) < 0) {
             *prefixLength = 0;
         } else {
-            *prefixLength = ipv4NetmaskToPrefixLength((int)
+            *prefixLength = ipv4NetmaskToPrefixLength(
                     ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr);
         }
     }