diff --git a/src/test/c/test_hangman_test.c b/src/test/c/test_hangman_test.c
index 98308e8..aade409 100644
--- a/src/test/c/test_hangman_test.c
+++ b/src/test/c/test_hangman_test.c
@@ -89,4 +89,17 @@ void test_erratenen_buchstaben_hinzufuegen_anhaengen_r_an_pete_zu_peter_richtig(
 	TEST_ASSERT_EQUAL_STRING(expected, actual);
 }
 
+void test_erratenen_buchstaben_hinzufuegen_anhaengen_r_an_peter_zu_peter_falsch() {
+    // arrange
+	char expected[100] = "peter";
+    char actual[100] = "peter";
+	char to_add = 'r';
+	
+    // act
+	erratenen_buchstaben_hinzufuegen(actual, to_add);
+
+    // assert
+	TEST_ASSERT_FALSE(expected == actual);
+}
+
 #endif // TEST