diff --git a/yaml/transform/environ.go b/yaml/transform/environ.go
index 582518b2d..a4f9694ba 100644
--- a/yaml/transform/environ.go
+++ b/yaml/transform/environ.go
@@ -32,15 +32,15 @@ func Environ(c *yaml.Config, envs map[string]string) error {
 		}
 		if httpProxy != "" {
 			p.Environment["HTTP_PROXY"] = httpProxy
-			p.Environment["http_proxy"] = strings.ToUpper(httpProxy)
+			p.Environment["http_proxy"] = httpProxy
 		}
 		if httpsProxy != "" {
 			p.Environment["HTTPS_PROXY"] = httpsProxy
-			p.Environment["https_proxy"] = strings.ToUpper(httpsProxy)
+			p.Environment["https_proxy"] = httpsProxy
 		}
 		if noProxy != "" {
 			p.Environment["NO_PROXY"] = noProxy
-			p.Environment["no_proxy"] = strings.ToUpper(noProxy)
+			p.Environment["no_proxy"] = noProxy
 		}
 	}
 	return nil