diff --git a/tests/server/sockfilt.c b/tests/server/sockfilt.c
index 3274127c8..eec0cd39f 100644
--- a/tests/server/sockfilt.c
+++ b/tests/server/sockfilt.c
@@ -435,8 +435,10 @@ static curl_socket_t mksock(bool use_ipv6)
   curl_socket_t sock;
 #ifdef ENABLE_IPV6
   if(!use_ipv6)
+#else
+    (void)use_ipv6;
 #endif
-    sock = socket(AF_INET, SOCK_STREAM, 0);
+  sock = socket(AF_INET, SOCK_STREAM, 0);
 #ifdef ENABLE_IPV6
   else
     sock = socket(AF_INET6, SOCK_STREAM, 0);