diff --git a/lib/output.js b/lib/output.js
index 65e365f..d2a2a7f 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -70,7 +70,7 @@ function createOutput(outFile, outputs, basePath, sourceMaps, sourceMapContents)
   };
 }
 
-function minify(output, fileName, mangle, uglifyOpts, sourceMapContents) {
+function minify(output, fileName, mangle, uglifyOpts) {
   var uglify = require('uglify-js');
   var ast;
   try{
@@ -98,7 +98,6 @@ function minify(output, fileName, mangle, uglifyOpts, sourceMapContents) {
     return comment.line === 1 && comment.col === 0;
   };
   outputOptions.source_map = sourceMap;
-  outputOptions.source_map_include_sources = sourceMapContents;
 
   output.source = ast.print_to_string(outputOptions);
   output.sourceMap = sourceMap;
@@ -140,7 +139,7 @@ exports.writeOutputs = function(outputs, baseURL, outputOpts) {
   var output = createOutput(outFile || path.resolve(basePath, fileName), outputs, basePath, outputOpts.sourceMaps, outputOpts.sourceMapContents);
 
   if (outputOpts.minify)
-    output = minify(output, fileName, outputOpts.mangle, outputOpts.uglify, outputOpts.sourceMapContents);
+    output = minify(output, fileName, outputOpts.mangle, outputOpts.uglify);
 
   if (outputOpts.sourceMaps == 'inline') {
     output.source = inlineSourceMap(output.source, output.sourceMap);