diff --git a/roll/roll.c b/roll/roll.c
index be441e0..755f952 100644
--- a/roll/roll.c
+++ b/roll/roll.c
@@ -71,7 +71,7 @@ range:			fprintf(stderr,
 		if(*ep != '\0')
 			goto error;
 
-		while(--r >= 0)
+		while(r --> 0)
 			fprintf(stdout, "%d\n", rand() % s + 1);
 	}