diff --git a/src/vs/platform/contextkey/common/contextkey.ts b/src/vs/platform/contextkey/common/contextkey.ts
index dad27b1742b62..01bef2897cedf 100644
--- a/src/vs/platform/contextkey/common/contextkey.ts
+++ b/src/vs/platform/contextkey/common/contextkey.ts
@@ -391,7 +391,7 @@ export class ContextKeyEqualsExpr implements IContextKeyExpression {
 	}
 
 	public serialize(): string {
-		return this.key + ' == \'' + this.value + '\'';
+		return `${this.key} == '${this.value}'`;
 	}
 
 	public keys(): string[] {
@@ -460,7 +460,7 @@ export class ContextKeyInExpr implements IContextKeyExpression {
 	}
 
 	public serialize(): string {
-		return this.key + ' in \'' + this.valueKey + '\'';
+		return `${this.key} in '${this.valueKey}'`;
 	}
 
 	public keys(): string[] {
@@ -578,7 +578,7 @@ export class ContextKeyNotEqualsExpr implements IContextKeyExpression {
 	}
 
 	public serialize(): string {
-		return this.key + ' != \'' + this.value + '\'';
+		return `${this.key} != '${this.value}'`;
 	}
 
 	public keys(): string[] {
@@ -634,7 +634,7 @@ export class ContextKeyNotExpr implements IContextKeyExpression {
 	}
 
 	public serialize(): string {
-		return '!' + this.key;
+		return `!${this.key}`;
 	}
 
 	public keys(): string[] {