diff --git a/src/vs/workbench/parts/debug/common/debugModel.ts b/src/vs/workbench/parts/debug/common/debugModel.ts
index 5b97853ef25bc309d0566c88daa1833420cf5b36..ddd0be8e6d741638579d55059b3e1816b8530296 100644
--- a/src/vs/workbench/parts/debug/common/debugModel.ts
+++ b/src/vs/workbench/parts/debug/common/debugModel.ts
@@ -432,10 +432,10 @@ export class Thread implements debug.IThread {
 
 			return response.body.stackFrames.map((rsf, level) => {
 				if (!rsf) {
-					return new StackFrame(this, 0, new Source({ name: UNKNOWN_SOURCE_LABEL }, false), nls.localize('unknownStack', "Unknown stack location"), null, null);
+					return new StackFrame(this, 0, new Source({ name: UNKNOWN_SOURCE_LABEL }, true), nls.localize('unknownStack', "Unknown stack location"), null, null);
 				}
 
-				return new StackFrame(this, rsf.id, rsf.source ? new Source(rsf.source) : new Source({ name: UNKNOWN_SOURCE_LABEL }, false), rsf.name, rsf.line, rsf.column);
+				return new StackFrame(this, rsf.id, rsf.source ? new Source(rsf.source, rsf.source.presentationHint === 'deemphasize') : new Source({ name: UNKNOWN_SOURCE_LABEL }, true), rsf.name, rsf.line, rsf.column);
 			});
 		}, (err: Error) => {
 			if (this.stoppedDetails) {
@@ -560,7 +560,7 @@ export class Process implements debug.IProcess {
 		this.threads.forEach(thread => {
 			thread.getCallStack().forEach(stackFrame => {
 				if (stackFrame.source.uri.toString() === uri.toString()) {
-					stackFrame.source.available = false;
+					stackFrame.source.deemphasize = true;
 				}
 			});
 		});
diff --git a/src/vs/workbench/parts/debug/common/debugSource.ts b/src/vs/workbench/parts/debug/common/debugSource.ts
index e51a24cfefb882ed0084dca578746d29f297dea5..f616063b26859fcc762c9cb9ebc2eb381a2dd73b 100644
--- a/src/vs/workbench/parts/debug/common/debugSource.ts
+++ b/src/vs/workbench/parts/debug/common/debugSource.ts
@@ -9,14 +9,12 @@ import { DEBUG_SCHEME } from 'vs/workbench/parts/debug/common/debug';
 export class Source {
 
 	public uri: uri;
-	public available: boolean;
 
 	private static INTERNAL_URI_PREFIX = `${DEBUG_SCHEME}://internal/`;
 
-	constructor(public raw: DebugProtocol.Source, available = true) {
+	constructor(public raw: DebugProtocol.Source, public deemphasize: boolean) {
 		const path = raw.path || raw.name;
 		this.uri = raw.sourceReference > 0 ? uri.parse(Source.INTERNAL_URI_PREFIX + raw.sourceReference + '/' + path) : uri.file(path);
-		this.available = available;
 	}
 
 	public get name() {
diff --git a/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts b/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts
index f6a27539f9b6354fa22da6f1ea2396918d8e2f88..4ba2c467049236083a710be94860192e048c4839 100644
--- a/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts
+++ b/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts
@@ -554,7 +554,7 @@ export class CallStackRenderer implements IRenderer {
 	}
 
 	private renderStackFrame(stackFrame: debug.IStackFrame, data: IStackFrameTemplateData): void {
-		stackFrame.source.available ? dom.removeClass(data.stackFrame, 'disabled') : dom.addClass(data.stackFrame, 'disabled');
+		stackFrame.source.deemphasize ? dom.addClass(data.stackFrame, 'disabled') : dom.removeClass(data.stackFrame, 'disabled');
 		data.file.title = stackFrame.source.raw.path || stackFrame.source.name;
 		data.label.textContent = stackFrame.name;
 		data.label.title = stackFrame.name;
diff --git a/src/vs/workbench/parts/debug/test/common/debugSource.test.ts b/src/vs/workbench/parts/debug/test/common/debugSource.test.ts
index ae95f3710e20931a04fb1d7679106a0847c79f9f..890b93aa85192c07380a5c228b25ba968e8176d1 100644
--- a/src/vs/workbench/parts/debug/test/common/debugSource.test.ts
+++ b/src/vs/workbench/parts/debug/test/common/debugSource.test.ts
@@ -15,9 +15,9 @@ suite('Debug - Source', () => {
 			path: '/xx/yy/zz',
 			sourceReference: 0
 		};
-		const source = new Source(rawSource);
+		const source = new Source(rawSource, false);
 
-		assert.equal(source.available, true);
+		assert.equal(source.deemphasize, false);
 		assert.equal(source.name, rawSource.name);
 		assert.equal(source.inMemory, false);
 		assert.equal(source.reference, rawSource.sourceReference);
@@ -30,9 +30,9 @@ suite('Debug - Source', () => {
 			name: 'internalModule.js',
 			sourceReference: 11
 		};
-		const source = new Source(rawSource);
+		const source = new Source(rawSource, true);
 
-		assert.equal(source.available, true);
+		assert.equal(source.deemphasize, true);
 		assert.equal(source.name, rawSource.name);
 		assert.equal(source.inMemory, true);
 		assert.equal(source.reference, rawSource.sourceReference);