diff --git a/package.json b/package.json
index 04ed076..96845b6 100644
--- a/package.json
+++ b/package.json
@@ -27,17 +27,17 @@
     "prebuild": "rimraf dist/*"
   },
   "dependencies": {
-    "compare-versions": "2.0.1",
+    "compare-versions": "2.0.2",
     "object-assign": "^4.0.1",
-    "rollup-pluginutils": "^1.3.1",
-    "tippex": "^2.1.1",
-    "typescript": "^1.8.9"
+    "rollup-pluginutils": "^1.5.1",
+    "tippex": "^2.2.0",
+    "typescript": "^1.8.10"
   },
   "devDependencies": {
-    "mocha": "^2.3.3",
+    "mocha": "^3.0.0",
     "rimraf": "^2.5.4",
-    "rollup": "^0.25.7",
-    "rollup-plugin-typescript": "^0.5.0"
+    "rollup": "^0.34.3",
+    "rollup-plugin-typescript": "^0.7.7"
   },
   "repository": {
     "type": "git",
diff --git a/src/index.ts b/src/index.ts
index a516022..3d44106 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -156,6 +156,10 @@ export default function typescript ( options: Options ) {
 			}
 
 			if ( !importer ) return null;
+			
+			if (path.sep !== "/") {
+				importer = importer.split(path.sep).join("/");
+			}
 
 			var result: ts.ResolvedModuleWithFailedLookupLocations;
 
@@ -208,7 +212,7 @@ export default function typescript ( options: Options ) {
 			});
 
 			if ( fatalError ) {
-				throw new Error( `There were TypeScript errors transpiling "${id}"` );
+				throw new Error( `There were TypeScript errors.` );
 			}
 
 			return {
diff --git a/test/test.js b/test/test.js
index aff2c87..9a3da9a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -82,7 +82,7 @@ describe( 'rollup-plugin-typescript', function () {
 
 	it( 'reports diagnostics and throws if errors occur during transpilation', function () {
 		return bundle( 'sample/syntax-error/missing-type.ts' ).catch( function ( error ) {
-			assert.ok( error.message.indexOf( 'There were TypeScript errors' ) === 0, 'Should reject erroneous code.' );
+			assert.ok( error.message.search( 'Error transforming') === 0 && error.message.search('There were TypeScript errors.' ) > -1, 'Should reject erroneous code.' );
 		});
 	});