diff --git a/Jakefile.js b/Jakefile.js
index 46f2a0fca96..9106c3c619d 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -717,7 +717,7 @@ function runTestsAndWriteOutput(file) {
     }
 
     var args = [];
-    args.push("-R", "TAP");
+    args.push("-R", "tap");
     args.push("--no-colors");
     args.push("-t", testTimeout);
     if (tests) {
@@ -1272,4 +1272,4 @@ function environmentVariableIsEnabled(name) {
 
 function environmentVariableIsDisabled(name) {
     return /^(no?|f(alse)?|off|disabled?|0|-)$/.test(process.env[name]);
-}
\ No newline at end of file
+}