diff --git a/src/material-examples/table-http/table-http-example.ts b/src/material-examples/table-http/table-http-example.ts
index 0c5b43d6653..62a555bf34b 100644
--- a/src/material-examples/table-http/table-http-example.ts
+++ b/src/material-examples/table-http/table-http-example.ts
@@ -68,8 +68,8 @@ export class ExampleHttpDao {
 export class ExampleDataSource extends DataSource<GithubIssue> {
   // The number of issues returned by github matching the query.
   resultsLength = 0;
-  isLoadingResults: boolean;
-  isRateLimitReached: boolean;
+  isLoadingResults = false;
+  isRateLimitReached = false;
 
   constructor(private exampleDatabase: ExampleHttpDao,
               private paginator: MdPaginator,