1 files changed, 1 insertions, 1 deletions
diff --git a/src/main.c b/src/main.c
index f3e11e93..13b513bb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1101,7 +1101,7 @@ parse_opt (int key, char *arg, struct argp_state *state)
 			char *p;
 			optimization_level = strtoul(arg, &p, 0);
 			if (*p)
-				argp_error(state, "-Olevel must be positive");
+				argp_error(state, "-O level must be a non-negative integer");
 		}
 		break;