diff --git a/lib/setopt.c b/lib/setopt.c
index e56d69129e..00dda4ea29 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -326,7 +326,7 @@ CURLcode Curl_setopt_SSLVERSION(struct Curl_easy *data, CURLoption option,
     if(option != CURLOPT_SSLVERSION)
       primary = &data->set.proxy_ssl.primary;
 #else
-    if(option) {}
+    (void)option; /* unused */
 #endif
     version = C_SSLVERSION_VALUE(arg);
     version_max = (long)C_SSLVERSION_MAX_VALUE(arg);