diff --git a/src/proxy.c b/src/proxy.c
index 3e6854ddc..28bcfa01f 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -150,7 +150,7 @@ static int proxy_parse_timeout(char **args, int section, struct proxy *proxy,
 
 	res = parse_time_err(args[1], &timeout, TIME_UNIT_MS);
 	if (res) {
-		snprintf(err, errlen, "unexpected character '%c' in %s timeout", *err, name);
+		snprintf(err, errlen, "unexpected character '%c' in %s timeout", *res, name);
 		return -1;
 	}