diff --git a/test/fff_test_cpp.cpp b/test/fff_test_cpp.cpp
index 92e2910..76ec90e 100644
--- a/test/fff_test_cpp.cpp
+++ b/test/fff_test_cpp.cpp
@@ -242,3 +242,15 @@ TEST_F(FFFTestSuite, default_constants_can_be_overridden)
     ASSERT_EQ(OVERRIDE_ARG_HIST_LEN, voidfunc2_fake.arg_history_len);
 }
 
+static int my_custom_fake_called = 0;
+void my_custom_fake(char a, char b)
+{
+    my_custom_fake_called++;
+}
+
+TEST_F(FFFTestSuite, can_register_custom_fake)
+{
+    voidfunc2_fake.custom_fake = my_custom_fake;
+    voidfunc2('a', 'b');
+    ASSERT_EQ(1, my_custom_fake_called);
+}