diff --git a/src/vs/workbench/parts/debug/browser/debugContentProvider.ts b/src/vs/workbench/parts/debug/browser/debugContentProvider.ts
index 7bb2d9ee15b046f6b27e9f39dedd587a9cc8f34a..37ca325f419886bf47c23d56bb13ce08e83d6318 100644
--- a/src/vs/workbench/parts/debug/browser/debugContentProvider.ts
+++ b/src/vs/workbench/parts/debug/browser/debugContentProvider.ts
@@ -51,7 +51,7 @@ export class DebugContentProvider implements IWorkbenchContribution, ITextModelC
 
 			return model;
 		}, (err: DebugProtocol.ErrorResponse) => {
-			this.debugService.deemphasizeSource(resource);
+			this.debugService.sourceIsNotAvailable(resource);
 			const modePromise = this.modeService.getOrCreateMode(MIME_TEXT);
 			const model = this.modelService.createModel(err.message, modePromise, resource);
 
diff --git a/src/vs/workbench/parts/debug/common/debug.ts b/src/vs/workbench/parts/debug/common/debug.ts
index 310e20a0d22e381d5256e5b98cbc659de5b2951a..141e4b3d0db27795032d162f01e7f88173368536 100644
--- a/src/vs/workbench/parts/debug/common/debug.ts
+++ b/src/vs/workbench/parts/debug/common/debug.ts
@@ -539,9 +539,9 @@ export interface IDebugService {
 	stopProcess(process: IProcess): TPromise<any>;
 
 	/**
-	 * Deemphasizes all sources with the passed uri. Source will appear as grayed out in callstack view.
+	 * Makes unavailable all sources with the passed uri. Source will appear as grayed out in callstack view.
 	 */
-	deemphasizeSource(uri: uri): void;
+	sourceIsNotAvailable(uri: uri): void;
 
 	/**
 	 * Gets the current debug model.
diff --git a/src/vs/workbench/parts/debug/common/debugModel.ts b/src/vs/workbench/parts/debug/common/debugModel.ts
index 02fae2419dcdc3ccf7b7d93f52456fbffe4888e7..86aef921d6620c7fcef0e27c71a41b6e198f9134 100644
--- a/src/vs/workbench/parts/debug/common/debugModel.ts
+++ b/src/vs/workbench/parts/debug/common/debugModel.ts
@@ -1054,10 +1054,10 @@ export class Model implements IModel {
 		this._onDidChangeWatchExpressions.fire();
 	}
 
-	public deemphasizeSource(uri: uri): void {
+	public sourceIsNotAvailable(uri: uri): void {
 		this.processes.forEach(p => {
 			if (p.sources.has(uri.toString())) {
-				p.sources.get(uri.toString()).presentationHint = 'deemphasize';
+				p.sources.get(uri.toString()).available = false;
 			}
 		});
 		this._onDidChangeCallStack.fire();
diff --git a/src/vs/workbench/parts/debug/common/debugSource.ts b/src/vs/workbench/parts/debug/common/debugSource.ts
index 18d8149f874bdde4e2c68e957ab80a0e549af8eb..a1a7a1e0db7865162e726f5771a8f32f841f26ad 100644
--- a/src/vs/workbench/parts/debug/common/debugSource.ts
+++ b/src/vs/workbench/parts/debug/common/debugSource.ts
@@ -12,12 +12,14 @@ const UNKNOWN_SOURCE_LABEL = nls.localize('unknownSource', "Unknown Source");
 export class Source {
 
 	public uri: uri;
+	public available: boolean;
 
 	constructor(public raw: DebugProtocol.Source, public presentationHint: string) {
 		if (!raw) {
 			this.raw = { name: UNKNOWN_SOURCE_LABEL };
 		}
 		const path = this.raw.path || this.raw.name;
+		this.available = this.raw.name !== UNKNOWN_SOURCE_LABEL;
 		this.uri = this.raw.sourceReference > 0 ? uri.parse(`${DEBUG_SCHEME}:${path}`) : uri.file(path);
 	}
 
@@ -33,10 +35,6 @@ export class Source {
 		return this.raw.sourceReference;
 	}
 
-	public get available() {
-		return this.raw.name !== UNKNOWN_SOURCE_LABEL && this.presentationHint !== 'deemphasize';
-	}
-
 	public get inMemory() {
 		return this.uri.toString().indexOf(`${DEBUG_SCHEME}:`) === 0;
 	}
diff --git a/src/vs/workbench/parts/debug/electron-browser/debugService.ts b/src/vs/workbench/parts/debug/electron-browser/debugService.ts
index 610377f48fec3ad2d757f0513b5eb44567ae0a35..7b7dec560c61e7f8bcd2ba9004f5e8309551b879 100644
--- a/src/vs/workbench/parts/debug/electron-browser/debugService.ts
+++ b/src/vs/workbench/parts/debug/electron-browser/debugService.ts
@@ -894,8 +894,8 @@ export class DebugService implements debug.IDebugService {
 		});
 	}
 
-	public deemphasizeSource(uri: uri): void {
-		this.model.deemphasizeSource(uri);
+	public sourceIsNotAvailable(uri: uri): void {
+		this.model.sourceIsNotAvailable(uri);
 	}
 
 	public restartProcess(process: debug.IProcess, restartData?: any): TPromise<any> {
diff --git a/src/vs/workbench/parts/debug/test/common/mockDebug.ts b/src/vs/workbench/parts/debug/test/common/mockDebug.ts
index 55b41b025e644900747ca9a47ac6ff33ee71e98e..ef3f4886a03fd189038e173483d31c5c60e6cd2d 100644
--- a/src/vs/workbench/parts/debug/test/common/mockDebug.ts
+++ b/src/vs/workbench/parts/debug/test/common/mockDebug.ts
@@ -97,7 +97,7 @@ export class MockDebugService implements debug.IDebugService {
 
 	public logToRepl(value: string): void { }
 
-	public deemphasizeSource(uri: uri): void { }
+	public sourceIsNotAvailable(uri: uri): void { }
 }
 
 export class MockSession implements debug.ISession {