diff --git a/test/mjsunit/test-http-tls.js b/test/mjsunit/test-http-tls.js
index 861b2812d1..2e5e4e84e1 100644
--- a/test/mjsunit/test-http-tls.js
+++ b/test/mjsunit/test-http-tls.js
@@ -21,9 +21,9 @@ var responses_sent = 0;
 var responses_recvd = 0;
 var body0 = "";
 var body1 = "";
-var caPem = fs.cat(fixturesDir+"/test_ca.pem").wait();
-var certPem = fs.cat(fixturesDir+"/test_cert.pem").wait();
-var keyPem = fs.cat(fixturesDir+"/test_key.pem").wait();
+var caPem = fs.readFile(fixturesDir+"/test_ca.pem").wait();
+var certPem = fs.readFile(fixturesDir+"/test_cert.pem").wait();
+var keyPem = fs.readFile(fixturesDir+"/test_key.pem").wait();
 
 
 var http_server=http.createServer(function (req, res) {
diff --git a/test/mjsunit/test-tcp-tls.js b/test/mjsunit/test-tcp-tls.js
index 9a47d5af1d..80f85d33b0 100644
--- a/test/mjsunit/test-tcp-tls.js
+++ b/test/mjsunit/test-tcp-tls.js
@@ -105,9 +105,9 @@ try {
 } 
 
 if (have_tls) {
-  var caPem = fs.cat(fixturesDir+"/test_ca.pem").wait();
-  var certPem = fs.cat(fixturesDir+"/test_cert.pem").wait();
-  var keyPem = fs.cat(fixturesDir+"/test_key.pem").wait();
+  var caPem = fs.readFile(fixturesDir+"/test_ca.pem").wait();
+  var certPem = fs.readFile(fixturesDir+"/test_cert.pem").wait();
+  var keyPem = fs.readFile(fixturesDir+"/test_key.pem").wait();
 
   /* All are run at once, so run on different ports */
   tlsTest(20443, "localhost", caPem, keyPem, certPem);