diff --git a/src/core/ddsi/src/ddsi_ipaddr.c b/src/core/ddsi/src/ddsi_ipaddr.c
index 0219d75..78913bf 100644
--- a/src/core/ddsi/src/ddsi_ipaddr.c
+++ b/src/core/ddsi/src/ddsi_ipaddr.c
@@ -38,7 +38,7 @@ int ddsi_ipaddr_compare (const os_sockaddr *const sa1, const os_sockaddr *const
         sin1 = (os_sockaddr_in *)sa1;
         sin2 = (os_sockaddr_in *)sa2;
         sz = sizeof(sin1->sin_addr);
-        eq = memcmp(&sin1->sin_addr, &sin2->sin_addr, sizeof(sz));
+        eq = memcmp(&sin1->sin_addr, &sin2->sin_addr, sz);
         break;
       }
       default: {
diff --git a/src/os/src/os_socket.c b/src/os/src/os_socket.c
index 1a976a5..54d7e6d 100644
--- a/src/os/src/os_socket.c
+++ b/src/os/src/os_socket.c
@@ -142,7 +142,7 @@ static int os_sockaddr_compare(
                 sin1 = (os_sockaddr_in *)sa1;
                 sin2 = (os_sockaddr_in *)sa2;
                 sz = sizeof(sin1->sin_addr);
-                eq = memcmp(&sin1->sin_addr, &sin2->sin_addr, sizeof(sz));
+                eq = memcmp(&sin1->sin_addr, &sin2->sin_addr, sz);
             }
                 break;
         }