diff --git a/fp.h b/fp.h
index 39dc112..40f5d6a 100644
--- a/fp.h
+++ b/fp.h
@@ -331,6 +331,7 @@ unsigned long long frn(unsigned long long dp, int *oflow) {
       frac64 = norm(frac64, oflow);
       return frac64;
     }
+    return dp;
   }
 }