diff --git a/source-map/source-map-tests.ts b/source-map/source-map-tests.ts
index 3ec6b666d6..ac621fe430 100644
--- a/source-map/source-map-tests.ts
+++ b/source-map/source-map-tests.ts
@@ -11,7 +11,7 @@ function testSourceMapConsumer() {
             version: 'foo',
             sources: ['foo', 'bar'],
             names: ['foo', 'bar'],
-            sourcesContent: 'foo',
+            sourcesContent: ['foo'],
             mappings: 'foo'
         });
 
diff --git a/source-map/source-map.d.ts b/source-map/source-map.d.ts
index a1d8e208b6..3ddd49b537 100644
--- a/source-map/source-map.d.ts
+++ b/source-map/source-map.d.ts
@@ -13,7 +13,7 @@ declare module SourceMap {
         version: string;
         sources: Array<string>;
         names: Array<string>;
-        sourcesContent?: string;
+        sourcesContent?: string[];
         mappings: string;
     }