1 files changed, 3 insertions, 3 deletions
diff --git a/test/parallel/test-tls-fast-writing.js b/test/parallel/test-tls-fast-writing.js
index e0f6062da0..05722d8959 100644
--- a/test/parallel/test-tls-fast-writing.js
+++ b/test/parallel/test-tls-fast-writing.js
@@ -32,9 +32,9 @@ const tls = require('tls');
 const fs = require('fs');
 
 const dir = common.fixturesDir;
-const options = { key: fs.readFileSync(dir + '/test_key.pem'),
-                  cert: fs.readFileSync(dir + '/test_cert.pem'),
-                  ca: [ fs.readFileSync(dir + '/test_ca.pem') ] };
+const options = { key: fs.readFileSync(`${dir}/test_key.pem`),
+                  cert: fs.readFileSync(`${dir}/test_cert.pem`),
+                  ca: [ fs.readFileSync(`${dir}/test_ca.pem`) ] };
 
 const server = tls.createServer(options, onconnection);
 let gotChunk = false;