diff --git a/src/tester/tester.c b/src/tester/tester.c
index ed47680..b2a9329 100644
--- a/src/tester/tester.c
+++ b/src/tester/tester.c
@@ -15,15 +15,17 @@ void run_tests(TestFunc *func1, ...) {
   va_list args;
   va_start(args, func1);
 
-  TestFunc *func = NULL;
+  TestFunc *func = va_arg(args, TestFunc *);
 
-  while ((func = va_arg(args, TestFunc *))) {
+  while (func) {
     TestFuncResult result = func();
     print_test_result(result);
 
     if (!result.passed) {
       exit(EXIT_FAILURE);
     }
+
+    func = va_arg(args, TestFunc *);
   }
 
   va_end(args);