diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 9de36f0687f..a5a4bceb43c 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -83,6 +83,7 @@ namespace ts.server {
         readonly ts: number;
         readonly tsx: number;
         readonly dts: number;
+        readonly deferred: number;
     }
 
     export interface OpenFileInfo {
diff --git a/src/server/project.ts b/src/server/project.ts
index a19739d2ba1..6073cd9caef 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -11,7 +11,7 @@ namespace ts.server {
 
     /* @internal */
     export function countEachFileTypes(infos: ScriptInfo[]): FileStats {
-        const result: Mutable<FileStats> = { js: 0, jsx: 0, ts: 0, tsx: 0, dts: 0 };
+        const result: Mutable<FileStats> = { js: 0, jsx: 0, ts: 0, tsx: 0, dts: 0, deferred: 0 };
         for (const info of infos) {
             switch (info.scriptKind) {
                 case ScriptKind.JS:
@@ -28,6 +28,9 @@ namespace ts.server {
                 case ScriptKind.TSX:
                     result.tsx += 1;
                     break;
+                case ScriptKind.Deferred:
+                    result.deferred += 1;
+                    break;
             }
         }
         return result;