Fix type error.

1 files changed, 1 insertions, 1 deletions

diff --git a/ratio.c b/ratio.c
index c2eef00..8f86f93 100644
--- a/ratio.c
+++ b/ratio.c
@@ -7,7 +7,7 @@ typedef unsigned long long num;
 
 typedef struct {bool s; num n; num d;} rational;
 
-unsigned int safe_sum(num n1, num n2){
+num safe_sum(num n1, num n2){
 	if(n2 > ULLONG_MAX-n1){
 		printf("Sum overflow: Adding %llu and %llu\n",n1,n2);
 		exit(1);