diff --git a/install-release.sh b/install-release.sh
index 890291d..0753b90 100644
--- a/install-release.sh
+++ b/install-release.sh
@@ -152,7 +152,7 @@ judgment_parameters() {
         break
         ;;
       '-p' | '--proxy')
-        if echo "${2:?undefine var}" | grep -qEo '^(https?|socks4a?|socks5h?):\/\/'; then
+        if ! echo "${2:?undefine var}" | grep -qEo '^(https?|socks4a?|socks5h?):\/\/'; then
           echo 'error: Please specify the correct proxy server address.'
           exit 1
         fi