diff --git a/goldens/public-api/core/errors.api.md b/goldens/public-api/core/errors.api.md
index 52f13d4b19b..ae6718eb300 100644
--- a/goldens/public-api/core/errors.api.md
+++ b/goldens/public-api/core/errors.api.md
@@ -191,8 +191,6 @@ export const enum RuntimeErrorCode {
     UNKNOWN_ELEMENT = 304,
     // (undocumented)
     UNSAFE_ATTRIBUTE_BINDING = -910,
-    // @deprecated (undocumented)
-    UNSAFE_IFRAME_ATTRS = -910,
     // (undocumented)
     UNSAFE_VALUE_IN_RESOURCE_URL = 904,
     // (undocumented)
diff --git a/packages/core/src/errors.ts b/packages/core/src/errors.ts
index 90e263e4c55..2da3d6edfaa 100644
--- a/packages/core/src/errors.ts
+++ b/packages/core/src/errors.ts
@@ -120,11 +120,6 @@ export const enum RuntimeErrorCode {
   MISSING_ZONEJS = 908,
   UNEXPECTED_ZONE_STATE = 909,
   UNSAFE_ATTRIBUTE_BINDING = -910,
-  /**
-   * @deprecated use `UNSAFE_ATTRIBUTE_BINDING` instead.
-   */
-  // tslint:disable-next-line:no-duplicate-enum-values
-  UNSAFE_IFRAME_ATTRS = -910,
   VIEW_ALREADY_DESTROYED = 911,
   COMPONENT_ID_COLLISION = -912,
   IMAGE_PERFORMANCE_WARNING = -913,