diff --git a/extensions/schema-compare/src/schemaCompareMainWindow.ts b/extensions/schema-compare/src/schemaCompareMainWindow.ts
index 80def1cce2..619cd4bf1e 100644
--- a/extensions/schema-compare/src/schemaCompareMainWindow.ts
+++ b/extensions/schema-compare/src/schemaCompareMainWindow.ts
@@ -15,7 +15,6 @@ import { getTelemetryErrorType, getEndpointName, verifyConnectionAndGetOwnerUri
 import { SchemaCompareDialog } from './dialogs/schemaCompareDialog';
 import { isNullOrUndefined } from 'util';
 const localize = nls.loadMessageBundle();
-const msSqlProvider = 'MSSQL';
 const diffEditorTitle = localize('schemaCompare.CompareDetailsTitle', 'Compare Details');
 const applyConfirmation = localize('schemaCompare.ApplyConfirmation', 'Are you sure you want to update the target?');
 const reCompareToRefeshMessage = localize('schemaCompare.RecompareToRefresh', 'Press Compare to refresh the comparison.');
@@ -74,7 +73,7 @@ export class SchemaCompareMainWindow {
 	public sourceEndpointInfo: mssql.SchemaCompareEndpointInfo;
 	public targetEndpointInfo: mssql.SchemaCompareEndpointInfo;
 
-	constructor() {
+	constructor(private schemaCompareService?: mssql.ISchemaCompareService) {
 		this.SchemaCompareActionMap = new Map<Number, string>();
 		this.SchemaCompareActionMap[mssql.SchemaUpdateAction.Delete] = localize('schemaCompare.deleteAction', 'Delete');
 		this.SchemaCompareActionMap[mssql.SchemaUpdateAction.Change] = localize('schemaCompare.changeAction', 'Change');
@@ -274,7 +273,7 @@ export class SchemaCompareMainWindow {
 
 	public async execute(): Promise<void> {
 		Telemetry.sendTelemetryEvent('SchemaComparisonStarted');
-		const service = await SchemaCompareMainWindow.getService(msSqlProvider);
+		const service = await this.getService();
 		if (!this.operationId) {
 			// create once per page
 			this.operationId = generateGuid();
@@ -590,7 +589,7 @@ export class SchemaCompareMainWindow {
 
 		// cancel compare
 		if (this.operationId) {
-			const service = await SchemaCompareMainWindow.getService(msSqlProvider);
+			const service = await this.getService();
 			const result = await service.schemaCompareCancel(this.operationId);
 
 			if (!result || !result.success) {
@@ -622,7 +621,7 @@ export class SchemaCompareMainWindow {
 				'startTime:': Date.now().toString(),
 				'operationId': this.comparisonResult.operationId
 			});
-			const service = await SchemaCompareMainWindow.getService(msSqlProvider);
+			const service = await this.getService();
 			const result = await service.schemaCompareGenerateScript(this.comparisonResult.operationId, this.targetEndpointInfo.serverName, this.targetEndpointInfo.databaseName, azdata.TaskExecutionMode.script);
 			if (!result || !result.success) {
 				Telemetry.sendTelemetryEvent('SchemaCompareGenerateScriptFailed', {
@@ -682,7 +681,7 @@ export class SchemaCompareMainWindow {
 					// disable apply and generate script buttons because the results are no longer valid after applying the changes
 					this.setButtonsForRecompare();
 
-					const service = await SchemaCompareMainWindow.getService(msSqlProvider);
+					const service = await this.getService();
 					const result = await service.schemaComparePublishChanges(this.comparisonResult.operationId, this.targetEndpointInfo.serverName, this.targetEndpointInfo.databaseName, azdata.TaskExecutionMode.execute);
 					if (!result || !result.success) {
 						Telemetry.sendTelemetryEvent('SchemaCompareApplyFailed', {
@@ -870,7 +869,7 @@ export class SchemaCompareMainWindow {
 			}
 
 			let fileUri = fileUris[0];
-			const service = await SchemaCompareMainWindow.getService('MSSQL');
+			const service = await this.getService();
 			let startTime = Date.now();
 			const result = await service.schemaCompareOpenScmp(fileUri.fsPath);
 			if (!result || !result.success) {
@@ -969,7 +968,7 @@ export class SchemaCompareMainWindow {
 
 			let startTime = Date.now();
 			Telemetry.sendTelemetryEvent('SchemaCompareSaveScmp');
-			const service = await SchemaCompareMainWindow.getService(msSqlProvider);
+			const service = await this.getService();
 			const result = await service.schemaCompareSaveScmp(this.sourceEndpointInfo, this.targetEndpointInfo, azdata.TaskExecutionMode.execute, this.deploymentOptions, filePath.fsPath, sourceExcludes, targetExcludes);
 			if (!result || !result.success) {
 				Telemetry.sendTelemetryEvent('SchemaCompareSaveScmpFailed', {
@@ -1012,14 +1011,16 @@ export class SchemaCompareMainWindow {
 		}
 	}
 
-	private static async getService(providerName: string): Promise<mssql.ISchemaCompareService> {
-		let service = (vscode.extensions.getExtension(mssql.extension.name).exports as mssql.IExtension).schemaCompare;
-		return service;
+	private async getService(): Promise<mssql.ISchemaCompareService> {
+		if (isNullOrUndefined(this.schemaCompareService)) {
+			this.schemaCompareService = (vscode.extensions.getExtension(mssql.extension.name).exports as mssql.IExtension).schemaCompare;
+		}
+		return this.schemaCompareService;
 	}
 
 	private async GetDefaultDeploymentOptions(): Promise<void> {
 		// Same as dacfx default options
-		const service = await SchemaCompareMainWindow.getService(msSqlProvider);
+		const service = await this.getService();
 		let result = await service.schemaCompareGetDefaultOptions();
 		this.setDeploymentOptions(result.defaultDeploymentOptions);
 	}
diff --git a/extensions/schema-compare/src/test/schemaCompare.test.ts b/extensions/schema-compare/src/test/schemaCompare.test.ts
index dc015c4935..77a8673ca8 100644
--- a/extensions/schema-compare/src/test/schemaCompare.test.ts
+++ b/extensions/schema-compare/src/test/schemaCompare.test.ts
@@ -69,7 +69,7 @@ describe('SchemaCompareResult.start', function (): void {
 	it('Should be correct when created.', async function (): Promise<void> {
 		let sc = new SchemaCompareTestService();
 
-		let result = new SchemaCompareMainWindow();
+		let result = new SchemaCompareMainWindow(sc);
 		await result.start(null);
 		let promise = new Promise(resolve => setTimeout(resolve, 5000)); // to ensure comparison result view is initialized
 		await promise;
@@ -80,6 +80,6 @@ describe('SchemaCompareResult.start', function (): void {
 		await result.execute();
 
 		should(result.getComparisonResult() !== undefined);
-		should(result.getComparisonResult().operationId !== undefined);
+		should(result.getComparisonResult().operationId === 'Test Operation Id');
 	});
 });