diff --git a/tests/cmake/test.cpp b/tests/cmake/test.cpp
index 71747949a0..f5fd4ecc2a 100644
--- a/tests/cmake/test.cpp
+++ b/tests/cmake/test.cpp
@@ -27,6 +27,9 @@
 class CurlClass {
 public:
   void curl_multi_setopt(void *a, int b, long c) {
+    (void)a;
+    (void)b;
+    (void)c;
     std::cout << curl_version() << std::endl;
   }
 };