diff --git a/sapi/fpm/fpm/zlog.c b/sapi/fpm/fpm/zlog.c
index cea0325897f..d158c06fd21 100644
--- a/sapi/fpm/fpm/zlog.c
+++ b/sapi/fpm/fpm/zlog.c
@@ -420,7 +420,7 @@ static inline ssize_t zlog_stream_unbuffered_write(
 			append = NULL;
 		} else {
 			append = "...";
-			append_len = sizeof(append) - 1;
+			append_len = sizeof("...") - 1;
 			len = zlog_limit - stream->len - append_len;
 		}
 	}