diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index c374f8add60..0d03f7d6236 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -1882,7 +1882,7 @@ module FourSlash {
                     );
                 assert.equal(
                     expected.join(","),
-                    actual.fileNameList.map( file => {
+                    actual.fileNames.map( file => {
                         return file.replace(this.basePath + "/", "")
                         }).join(",")
                     );
diff --git a/src/server/client.ts b/src/server/client.ts
index e4a524dd210..9a6fbaa3a77 100644
--- a/src/server/client.ts
+++ b/src/server/client.ts
@@ -183,7 +183,7 @@ namespace ts.server {
 
             return {
                 configFileName: response.body.configFileName,
-                fileNameList: response.body.fileNameList
+                fileNames: response.body.fileNames
             };
         }