diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index a495e65a26829d1d4a7813b613dc886b9d5e0c16..6a31141bb94bedad5fa8e795d65715b2493136ca 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1277,13 +1277,6 @@ declare module 'vscode' {
 
 	//#region Deprecated support
 
-	export interface CompletionItem {
-		/**
-		 * Indicates if this item is deprecated.
-		 */
-		deprecated?: boolean;
-	}
-
 	export enum DiagnosticTag {
 		/**
 		 * Deprecated or obsolete code
diff --git a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
index 3541ba2eef043f8e784852e39add4a2d976d9e38..75af9eebf0146abe4b7f552860b3173b31674640 100644
--- a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
+++ b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
@@ -341,7 +341,6 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 			commitCharacters: data.k,
 			additionalTextEdits: data.l,
 			command: data.m,
-			deprecated: data.n,
 			// not-standard
 			_id: data.x,
 		};
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 1e30b620dcafbf9261892806cad3e4602a77c7d6..8fb612d3a7c81a974fe1d520e40bc19dc5c4ef73 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -937,7 +937,6 @@ export interface SuggestDataDto {
 	k/* commitCharacters */?: string[];
 	l/* additionalTextEdits */?: ISingleEditOperation[];
 	m/* command */?: modes.Command;
-	n/* deprecated */?: boolean;
 	// not-standard
 	x?: ChainedCacheId;
 }
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index 6c7065f29f2ca6501d03f18eb2270730a7d08fcd..884618cc457c4d9f0dee5bb648ae7e138b4c8df8 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -736,7 +736,6 @@ class SuggestAdapter {
 			k: item.commitCharacters,
 			l: item.additionalTextEdits && item.additionalTextEdits.map(typeConvert.TextEdit.from),
 			m: this._commands.toInternal(item.command, disposables),
-			n: item.deprecated
 		};
 
 		// 'insertText'-logic