diff --git a/src/temperatur.h b/src/temperatur.h
index ebdea50..d4f13bf 100644
--- a/src/temperatur.h
+++ b/src/temperatur.h
@@ -8,5 +8,6 @@ float FzuC(float tempF);
 float FzuK(float tempF);
 
 float KzuC(float tempK);
+float KzuF(float tempK);
 
 #endif //TEMPERATUR_H
diff --git a/test/test_temperatur.c b/test/test_temperatur.c
index e27c7da..e22c8e1 100644
--- a/test/test_temperatur.c
+++ b/test/test_temperatur.c
@@ -46,4 +46,11 @@ float result = KzuC(298.15);
 float expected = 25;
 TEST_ASSERT_EQUAL(expected, result);
 }
+void test_temperaturRechner_KzuF(void)
+{
+float result = KzuF(298.15);
+float expected = 77;
+TEST_ASSERT_EQUAL(expected, result);
+}
+
 #endif