diff --git a/packages/compiler/src/shadow_css.ts b/packages/compiler/src/shadow_css.ts
index 166622d611..c65e6883bf 100644
--- a/packages/compiler/src/shadow_css.ts
+++ b/packages/compiler/src/shadow_css.ts
@@ -146,10 +146,12 @@ export class ShadowCss {
   * - hostSelector is the attribute added to the host itself.
   */
   shimCssText(cssText: string, selector: string, hostSelector: string = ''): string {
-    const sourceMappingUrl: string = extractSourceMappingUrl(cssText);
+    const commentsWithHash = extractCommentsWithHash(cssText);
     cssText = stripComments(cssText);
     cssText = this._insertDirectives(cssText);
-    return this._scopeCssText(cssText, selector, hostSelector) + sourceMappingUrl;
+
+    const scopedCssText = this._scopeCssText(cssText, selector, hostSelector);
+    return [scopedCssText, ...commentsWithHash].join('\n');
   }
 
   private _insertDirectives(cssText: string): string {
@@ -544,12 +546,10 @@ function stripComments(input: string): string {
   return input.replace(_commentRe, '');
 }
 
-// all comments except inline source mapping
-const _sourceMappingUrlRe = /\/\*\s*#\s*sourceMappingURL=[\s\S]+?\*\//;
+const _commentWithHashRe = /\/\*\s*#\s*source(Mapping)?URL=[\s\S]+?\*\//g;
 
-function extractSourceMappingUrl(input: string): string {
-  const matcher = input.match(_sourceMappingUrlRe);
-  return matcher ? matcher[0] : '';
+function extractCommentsWithHash(input: string): string[] {
+  return input.match(_commentWithHashRe) || [];
 }
 
 const _ruleRe = /(\s*)([^;\{\}]+?)(\s*)((?:{%BLOCK%}?\s*;?)|(?:\s*;))/g;
diff --git a/packages/compiler/test/shadow_css_spec.ts b/packages/compiler/test/shadow_css_spec.ts
index 646e8658a5..8bf0cd85e2 100644
--- a/packages/compiler/test/shadow_css_spec.ts
+++ b/packages/compiler/test/shadow_css_spec.ts
@@ -300,6 +300,11 @@ import {normalizeCSS} from '@angular/platform-browser/testing/src/browser_util';
       expect(s('b {c}/* #sourceMappingURL=data:x */', 'contenta'))
           .toEqual('b[contenta] {c}/* #sourceMappingURL=data:x */');
     });
+
+    it('should keep sourceURL comments', () => {
+      expect(s('/*# sourceMappingURL=data:x */b {c}/*# sourceURL=xxx */', 'contenta'))
+          .toEqual('b[contenta] {c}/*# sourceMappingURL=data:x *//*# sourceURL=xxx */');
+    });
   });
 
   describe('processRules', () => {