diff --git a/coinflip.c b/coinflip.c
index 376072a..0783b5a 100644
--- a/coinflip.c
+++ b/coinflip.c
@@ -10,7 +10,7 @@ int main() {
     char rawInput[19];
     fgets(rawInput, 19, stdin);
     printf("rawInput = %s\n", rawInput);
-    long int flips = strtol(rawInput, NULL, 0);
+    unsigned long int flips = strtol(rawInput, NULL, 0);
     printf("Ok, flipping %li times!\n", flips);
 
     long int headsCount = 0;