diff --git a/package.json b/package.json
index 3b3cd3a3..ab9a72ce 100644
--- a/package.json
+++ b/package.json
@@ -48,8 +48,8 @@
     "reflect-metadata": "0.1.10",
     "rimraf": "2.6.1",
     "tslint": "4.5.1",
-    "typescript": "2.4.2",
+    "typescript": "2.6.2",
     "webpack": "2.3.2",
     "webpack-dev-server": "2.4.2"
   }
-}
\ No newline at end of file
+}
diff --git a/src/elements/identity.ts b/src/elements/identity.ts
index e8fd1c62..4905c0eb 100644
--- a/src/elements/identity.ts
+++ b/src/elements/identity.ts
@@ -63,7 +63,8 @@ export abstract class IdentityBase {
  * Points to all entities.
  */
 export class All extends IdentityBase {
-    readonly type = "all";
+    // we have to explicitly state the type, otherwise its missing @ d.ts
+    readonly type: "all" = "all";
 
     /** @inheritdoc */
     readonly priority = 0;
@@ -82,7 +83,8 @@ export class All extends IdentityBase {
  * Points a set of entities specified by their primary keys.
  */
 export class ByIds extends IdentityBase {
-    readonly type = "ids";
+    // we have to explicitly state the type, otherwise its missing @ d.ts
+    readonly type: "ids" = "ids";
 
     /** @inheritdoc */
     readonly priority = 1;
@@ -119,7 +121,8 @@ export class ByIds extends IdentityBase {
  * Points to a set of entities specified by the values of indexed properties.
  */
 export class ByIndexes extends IdentityBase {
-    readonly type = "indexes";
+    // we have to explicitly state the type, otherwise its missing @ d.ts
+    readonly type: "indexes" = "indexes";
 
     /** @inheritdoc */
     readonly priority = 2;