diff --git a/src/vs/editor/common/model/modelLine.ts b/src/vs/editor/common/model/modelLine.ts
index dfe85c80b254abca8b056864c0d37aba83e0dd05..b96267c425333d9594acc4b9ff5f4be91d833cee 100644
--- a/src/vs/editor/common/model/modelLine.ts
+++ b/src/vs/editor/common/model/modelLine.ts
@@ -160,7 +160,6 @@ function computePlusOneIndentLevel(line: string, tabSize: number): number {
 
 export interface IModelLine {
 	readonly text: string;
-	isInvalid: boolean;
 
 	// --- markers
 	addMarker(marker: LineMarker): void;
@@ -171,6 +170,8 @@ export interface IModelLine {
 
 	// --- tokenization
 	resetTokenizationState(): void;
+	isInvalid(): boolean;
+	setIsInvalid(isInvalid: boolean): void;
 	getState(): IState;
 	setState(state: IState): void;
 	getTokens(topLevelLanguageId: LanguageId): LineTokens;
@@ -198,12 +199,12 @@ export class ModelLine implements IModelLine {
 	 */
 	private _metadata: number;
 
-	public get isInvalid(): boolean {
+	public isInvalid(): boolean {
 		return (this._metadata & 0x00000001) ? true : false;
 	}
 
-	public set isInvalid(value: boolean) {
-		this._metadata = (this._metadata & 0xfffffffe) | (value ? 1 : 0);
+	public setIsInvalid(isInvalid: boolean): void {
+		this._metadata = (this._metadata & 0xfffffffe) | (isInvalid ? 1 : 0);
 	}
 
 	/**
diff --git a/src/vs/editor/common/model/textModelWithTokens.ts b/src/vs/editor/common/model/textModelWithTokens.ts
index 534201b952c67ff29cbd386484482fdf8398aaaa..6c24d232f446899201ed56466df8283234e1b358 100644
--- a/src/vs/editor/common/model/textModelWithTokens.ts
+++ b/src/vs/editor/common/model/textModelWithTokens.ts
@@ -232,10 +232,10 @@ export class TextModelWithTokens extends TextModel implements editorCommon.IToke
 	}
 
 	protected _invalidateLine(lineIndex: number): void {
-		this._lines[lineIndex].isInvalid = true;
+		this._lines[lineIndex].setIsInvalid(true);
 		if (lineIndex < this._invalidLineStartIndex) {
 			if (this._invalidLineStartIndex < this._lines.length) {
-				this._lines[this._invalidLineStartIndex].isInvalid = true;
+				this._lines[this._invalidLineStartIndex].setIsInvalid(true);
 			}
 			this._invalidLineStartIndex = lineIndex;
 			this._beginBackgroundTokenization();
@@ -353,14 +353,14 @@ export class TextModelWithTokens extends TextModel implements editorCommon.IToke
 			}
 			this._lines[lineIndex].setTokens(this._languageIdentifier.id, r.tokens);
 			eventBuilder.registerChangedTokens(lineIndex + 1);
-			this._lines[lineIndex].isInvalid = false;
+			this._lines[lineIndex].setIsInvalid(false);
 
 			if (endStateIndex < linesLength) {
 				if (this._lines[endStateIndex].getState() !== null && r.endState.equals(this._lines[endStateIndex].getState())) {
 					// The end state of this line remains the same
 					let nextInvalidLineIndex = lineIndex + 1;
 					while (nextInvalidLineIndex < linesLength) {
-						if (this._lines[nextInvalidLineIndex].isInvalid) {
+						if (this._lines[nextInvalidLineIndex].isInvalid()) {
 							break;
 						}
 						if (nextInvalidLineIndex + 1 < linesLength) {
diff --git a/src/vs/editor/test/common/model/model.modes.test.ts b/src/vs/editor/test/common/model/model.modes.test.ts
index 9a891182471f22fbb66e0a4305fdc194e8a4fcd6..474c259b0c38a6e436cb6467c7caefbb53a4fbb9 100644
--- a/src/vs/editor/test/common/model/model.modes.test.ts
+++ b/src/vs/editor/test/common/model/model.modes.test.ts
@@ -186,7 +186,7 @@ suite('Editor Model - Model Modes 2', () => {
 	function invalidEqual(model: Model, expected: number[]): void {
 		let actual: number[] = [];
 		for (let i = 0, len = model.getLineCount(); i < len; i++) {
-			if (model._lines[i].isInvalid) {
+			if (model._lines[i].isInvalid()) {
 				actual.push(i);
 			}
 		}