diff --git a/Jakefile.js b/Jakefile.js
index f1a714c1e2..286fb98cff 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -321,9 +321,6 @@ function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts
             }
             else {
                 options += " -sourcemap";
-                if (!opts.noMapRoot) {
-                    options += " -mapRoot file:///" + path.resolve(path.dirname(outFile));
-                }
             }
         }
         else {