diff --git a/src/calculateFactorial.c b/src/calculateFactorial.c
index 3c63247..af91e81 100644
--- a/src/calculateFactorial.c
+++ b/src/calculateFactorial.c
@@ -17,4 +17,6 @@ int calculateFactorial_integer(int n) {
         }
         return result;
     }
+    return 0;
 }
+