diff --git a/lib/middleware/karma.js b/lib/middleware/karma.js
index a36a53617..f1b632a31 100644
--- a/lib/middleware/karma.js
+++ b/lib/middleware/karma.js
@@ -151,6 +151,8 @@ var createKarmaMiddleware = function (filesPromise, serveStaticFile, serveFile,
           var mappings = files.served.map(function (file) {
             // Windows paths contain backslashes and generate bad IDs if not escaped
             var filePath = filePathToUrlPath(file.path, basePath, urlRoot).replace(/\\/g, '\\\\')
+            // Escape any quotes that might be in the filename
+            filePath = filePath.replace(/'/g, '\\\'').replace(/"/g, '\\\"')
 
             return util.format("  '%s': '%s'", filePath, file.sha)
           })