diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/window.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/window.test.ts
index 87734062b8a006d56828bb3b1fb576cbba43420d..50ef55b4f55ba4d9d6f98d9af7a1dd21a0f5bf89 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/window.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/window.test.ts
@@ -646,7 +646,7 @@ suite('window namespace tests', () => {
 			});
 			const renderer = window.createTerminalRenderer('foo');
 			const reg2 = renderer.onDidChangeMaximumDimensions(dimensions => {
-				assert.ok(dimensions.cols > 0);
+				assert.ok(dimensions.columns > 0);
 				assert.ok(dimensions.rows > 0);
 				reg2.dispose();
 				const reg3 = window.onDidCloseTerminal(() => {
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index bfc033ca751dcda4ad2ba06389a1f8f648e49966..04d85d9ed84ac659f23181f8aecb8158cac2cc9e 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -351,7 +351,7 @@ declare module 'vscode' {
 		/**
 		 * The number of columns in the terminal.
 		 */
-		cols: number;
+		columns: number;
 
 		/**
 		 * The number of rows in the terminal.
diff --git a/src/vs/workbench/api/node/extHostTerminalService.ts b/src/vs/workbench/api/node/extHostTerminalService.ts
index 5589c5383316e79797b17e5c390afd0e9acdb66a..e4f5405418cbb9b65dffc11f7c10b7e719efb671 100644
--- a/src/vs/workbench/api/node/extHostTerminalService.ts
+++ b/src/vs/workbench/api/node/extHostTerminalService.ts
@@ -179,7 +179,7 @@ export class ExtHostTerminalRenderer extends BaseExtHostTerminal implements vsco
 		}
 		return {
 			rows: this._maximumDimensions.rows,
-			cols: this._maximumDimensions.cols
+			columns: this._maximumDimensions.columns
 		};
 	}
 
@@ -212,8 +212,8 @@ export class ExtHostTerminalRenderer extends BaseExtHostTerminal implements vsco
 		this._onInput.fire(data);
 	}
 
-	public _setMaximumDimensions(cols: number, rows: number): void {
-		this._maximumDimensions = { cols, rows };
+	public _setMaximumDimensions(columns: number, rows: number): void {
+		this._maximumDimensions = { columns, rows };
 		this._onDidChangeMaximumDimensions.fire(this.maximumDimensions);
 	}
 }