diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index dc5180f7f..506d060d1 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -495,6 +495,11 @@ parameters:
 			count: 1
 			path: src/Handler/CurlFactory.php
 
+		-
+			message: "#^Parameter \\#1 \\$filename of function is_dir expects string, string\\|false given\\.$#"
+			count: 1
+			path: src/Handler/CurlFactory.php
+
 		-
 			message: "#^Method GuzzleHttp\\\\Handler\\\\CurlFactory\\:\\:retryFailedRewind\\(\\) has no return typehint specified\\.$#"
 			count: 1
diff --git a/tests/server.js b/tests/server.js
index 8e2ab249d..f6c336a5a 100644
--- a/tests/server.js
+++ b/tests/server.js
@@ -178,7 +178,7 @@ var GuzzleServer = function(port, log) {
         that.responses = JSON.parse(request.body);
         for (var i = 0; i < that.responses.length; i++) {
           if (that.responses[i].body) {
-            that.responses[i].body = new Buffer.from(that.responses[i].body, 'base64');
+            that.responses[i].body = Buffer.from(that.responses[i].body, 'base64');
           }
         }
         if (that.log) {