diff --git a/sources/reactphysics3d/testing/testing_mathematics/Matrix3x3Test.h b/sources/reactphysics3d/testing/testing_mathematics/Matrix3x3Test.h
index d90d1cb1..04859c39 100644
--- a/sources/reactphysics3d/testing/testing_mathematics/Matrix3x3Test.h
+++ b/sources/reactphysics3d/testing/testing_mathematics/Matrix3x3Test.h
@@ -380,7 +380,7 @@ class Matrix3x3Test : public TestSuite::Test {
             test_(result.getValue(2,2) == 256);
         }
 
-        testOperatorMultiplicationWithVector() {
+        void testOperatorMultiplicationWithVector() {
             Vector3D vector(4,7,3);
             Vector3D result = matrix1 * vector;
             test_(result.getX() == 46);