diff --git a/packages/debug/src/browser/breakpoint/breakpoint-manager.ts b/packages/debug/src/browser/breakpoint/breakpoint-manager.ts
index f13006c8fb008..144036ea16d49 100644
--- a/packages/debug/src/browser/breakpoint/breakpoint-manager.ts
+++ b/packages/debug/src/browser/breakpoint/breakpoint-manager.ts
@@ -78,7 +78,7 @@ export class BreakpointsManager implements FrontendApplicationContribution {
      * @param editor the active text editor
      * @param position the mouse position in the editor
      */
-    toggleBreakpoint(editor: TextEditor, position: Position): void {
+    async toggleBreakpoint(editor: TextEditor, position: Position): Promise<void> {
         const debugSession = this.debugSessionManager.getActiveDebugSession();
 
         const srcBreakpoint = this.createSourceBreakpoint(debugSession, editor, position);
@@ -92,7 +92,7 @@ export class BreakpointsManager implements FrontendApplicationContribution {
 
         if (debugSession) {
             const source = DebugUtils.toSource(editor.uri, debugSession);
-            this.breakpointApplier.applySessionBreakpoints(debugSession, source);
+            await this.breakpointApplier.applySessionBreakpoints(debugSession, source);
         }
 
         this.breakpointDecorator.applyDecorations(editor);
@@ -103,14 +103,14 @@ export class BreakpointsManager implements FrontendApplicationContribution {
      * Returns all breakpoints for the given debug session.
      * @param sessionId the debug session identifier
      */
-    get(sessionId: string | undefined): ExtDebugProtocol.AggregatedBreakpoint[] {
+    async get(sessionId: string | undefined): Promise<ExtDebugProtocol.AggregatedBreakpoint[]> {
         return this.breakpointStorage.get().filter(b => b.sessionId === sessionId);
     }
 
     /**
      * Returns all breakpoints.
      */
-    getAll(): ExtDebugProtocol.AggregatedBreakpoint[] {
+    async getAll(): Promise<ExtDebugProtocol.AggregatedBreakpoint[]> {
         return this.breakpointStorage.get();
     }
 
@@ -255,7 +255,7 @@ export class BreakpointsManager implements FrontendApplicationContribution {
                         debugSession.stacks(args).then(response => {
                             const frame = response.body.stackFrames[0];
                             if (frame) {
-                                this.sourceOpener.open(frame).then(widget => this.lineDecorator.applyDecorations());
+                                this.sourceOpener.open(frame).then(() => this.lineDecorator.applyDecorations());
                             }
                         });
                     }
diff --git a/packages/debug/src/browser/debug-utils.ts b/packages/debug/src/browser/debug-utils.ts
index a9ea461389bc8..5e47975f25dde 100644
--- a/packages/debug/src/browser/debug-utils.ts
+++ b/packages/debug/src/browser/debug-utils.ts
@@ -26,7 +26,7 @@ import { DebugSession } from './debug-model';
 export class SourceOpener {
     constructor(@inject(EditorManager) protected readonly editorManager: EditorManager) { }
 
-    async open(frame: DebugProtocol.StackFrame): Promise<EditorWidget> {
+    open(frame: DebugProtocol.StackFrame): Promise<EditorWidget> {
         if (!frame.source) {
             return Promise.reject(`The source '${frame.name}' to open is not specified.`);
         }
diff --git a/packages/debug/src/browser/view/debug-breakpoints-widget.ts b/packages/debug/src/browser/view/debug-breakpoints-widget.ts
index 0b37062d4b588..8a90896be6a3e 100644
--- a/packages/debug/src/browser/view/debug-breakpoints-widget.ts
+++ b/packages/debug/src/browser/view/debug-breakpoints-widget.ts
@@ -62,11 +62,11 @@ export class DebugBreakpointsWidget extends VirtualWidget {
         return this.onDidDblClickBreakpointEmitter.event;
     }
 
-    refreshBreakpoints(): void {
+    async refreshBreakpoints(): Promise<void> {
         if (this.debugSession) {
-            this.breakpoints = this.breakpointManager.get(this.debugSession.sessionId);
+            this.breakpoints = await this.breakpointManager.get(this.debugSession.sessionId);
         } else {
-            this.breakpoints = this.breakpointManager.getAll();
+            this.breakpoints = await this.breakpointManager.getAll();
         }
         super.update();
     }