diff --git a/tests/d3d12.c b/tests/d3d12.c
index ed4d017c..2d24f054 100644
--- a/tests/d3d12.c
+++ b/tests/d3d12.c
@@ -40626,12 +40626,12 @@ static void test_stencil_export(bool use_dxil)
     destroy_test_context(&context);
 }
 
-static void test_stencil_export_dxbc()
+static void test_stencil_export_dxbc(void)
 {
     test_stencil_export(false);
 }
 
-static void test_stencil_export_dxil()
+static void test_stencil_export_dxil(void)
 {
     test_stencil_export(true);
 }