diff --git a/src/ageinseconds.h b/src/ageinseconds.h
index a490ee6..2b7a006 100644
--- a/src/ageinseconds.h
+++ b/src/ageinseconds.h
@@ -3,5 +3,6 @@
 
 int sekunden(int jahre);
 int minuten(int jahre);
+int stunden(int jahre);
 
 #endif // AGEINSECONDS_H
diff --git a/test/test_ageinseconds.c b/test/test_ageinseconds.c
index 90fdb9a..4d2c16d 100644
--- a/test/test_ageinseconds.c
+++ b/test/test_ageinseconds.c
@@ -26,4 +26,11 @@ void test_ageinseconds_23_in_minuten(void)
     TEST_ASSERT_EQUAL(12088800, result);
 }
 
+// test stunden
+void test_ageinseconds_34_in_stunden(void)
+{
+    float result = stunden(34);
+    TEST_ASSERT_EQUAL(297840, result);
+}
+
 #endif // TEST