diff --git a/src/runner.c b/src/runner.c
index c0ec085..388d0da 100644
--- a/src/runner.c
+++ b/src/runner.c
@@ -58,7 +58,7 @@ IMPL_SECTION_LIMITS(struct criterion_suite, cr_sts);
 TestSuite();
 Test(,) {};
 
-static INLINE void nothing() {}
+static INLINE void nothing(void) {}
 
 int cmp_suite(void *a, void *b) {
     struct criterion_suite *s1 = a, *s2 = b;
@@ -169,14 +169,14 @@ static void run_test_child(struct criterion_test *test,
 
     send_event(PRE_INIT, NULL, 0);
     if (suite->data)
-        suite->data->init ? suite->data->init() : nothing();
-    test->data->init ? test->data->init() : nothing();
+        (suite->data->init ? suite->data->init : nothing)();
+    (test->data->init ? test->data->init : nothing)();
     send_event(PRE_TEST, NULL, 0);
 
     struct timespec_compat ts;
     if (setup_abort_test()) {
         timer_start(&ts);
-        test->test ? test->test() : nothing();
+        (test->test ? test->test : nothing)();
     }
 
     double elapsed_time;
@@ -184,9 +184,9 @@ static void run_test_child(struct criterion_test *test,
         elapsed_time = -1;
 
     send_event(POST_TEST, &elapsed_time, sizeof (double));
-    test->data->fini ? test->data->fini() : nothing();
+    (test->data->fini ? test->data->fini : nothing)();
     if (suite->data)
-        suite->data->fini ? suite->data->fini() : nothing();
+        (suite->data->fini ? suite->data->fini : nothing)();
     send_event(POST_FINI, NULL, 0);
 }