diff --git a/tests/test_nat_engine.c b/tests/test_nat_engine.c
index 1015f941..b51b342f 100644
--- a/tests/test_nat_engine.c
+++ b/tests/test_nat_engine.c
@@ -48,9 +48,10 @@ static void build_ip_hdr(uint8_t* buf, uint8_t proto, uint32_t src_host, uint32_
     buf[8] = 64;
     buf[9] = proto;
     memset(buf + 10, 0, 2); // checksum slot = 0 for now
-    uint32_t s_net = htobe32(src_host), d_net = htobe32(dst_host);
-    memcpy(buf + 12, &s_net, 4);
-    memcpy(buf + 16, &d_net, 4);
+    uint32_t src_net = htobe32(src_host);
+    uint32_t dst_net = htobe32(dst_host);
+    memcpy(buf + 12, &src_net, 4);
+    memcpy(buf + 16, &dst_net, 4);
 }
 
 static void compute_ip_checksum(uint8_t* ip) {