diff --git a/src/c/rockPaperScissors.c b/src/c/rockPaperScissors.c
index a8477e6..7a98a97 100644
--- a/src/c/rockPaperScissors.c
+++ b/src/c/rockPaperScissors.c
@@ -44,8 +44,11 @@ int wasGameWon(roundsToWin, playerWins, computerWins){
 
 bool validatePlayerInput(int playerInput){
     bool inputValid;
-    if (playerInput == ROCK || PAPER || SCISSORS){
+    if (playerInput == ROCK || playerInput == PAPER || playerInput == SCISSORS){
         inputValid = true;
     }
+    else {
+        inputValid = false;
+    }
     return inputValid;
 }
\ No newline at end of file
diff --git a/test/c/test_rockPaperScissors.c b/test/c/test_rockPaperScissors.c
index 69d6761..5b492e4 100644
--- a/test/c/test_rockPaperScissors.c
+++ b/test/c/test_rockPaperScissors.c
@@ -187,7 +187,7 @@ void test_rockPaperScissors_validPlayerInput(void)
     /* arrange */
     //Hier die Werte eingeben
     bool result;
-    int playerInput = 1;
+    int playerInput = 2;
 
     /* act */
     //Die Funktion wird ausgeführt
@@ -198,6 +198,22 @@ void test_rockPaperScissors_validPlayerInput(void)
     TEST_ASSERT_EQUAL_INT(true, result);
 }
 
+void test_rockPaperScissors_invalidPlayerInput(void)
+{
+    /* arrange */
+    //Hier die Werte eingeben
+    bool result;
+    int playerInput = 5;
+
+    /* act */
+    //Die Funktion wird ausgeführt
+    result = validatePlayerInput(playerInput);
+
+    /* assert */
+    //Vergleichen
+    TEST_ASSERT_EQUAL_INT(false, result);
+}
+
 #endif // TEST
 
 /*Testcases: