diff --git a/src/chromeDebugAdapter.ts b/src/chromeDebugAdapter.ts
index ec3ddc1..87a4f0c 100644
--- a/src/chromeDebugAdapter.ts
+++ b/src/chromeDebugAdapter.ts
@@ -279,7 +279,7 @@ export function resolveWebRootPattern(webRoot: string, sourceMapPathOverrides: I
     for (let pattern in sourceMapPathOverrides) {
         const replacePattern = replaceWebRootInSourceMapPathOverridesEntry(webRoot, pattern, warnOnMissing);
         const replacePatternValue = replaceWebRootInSourceMapPathOverridesEntry(webRoot, sourceMapPathOverrides[pattern], warnOnMissing);
-        
+
         resolvedOverrides[replacePattern] = replacePatternValue;
     }
 
@@ -297,10 +297,10 @@ function replaceWebRootInSourceMapPathOverridesEntry(webRoot: string, entry: str
     } else if (webRootIndex > 0) {
         logger.log('Warning: in a sourceMapPathOverrides entry, ${webRoot} is only valid at the beginning of the path');
     }
-    
+
     return entry;
-}                                                     
-                                                     
+}
+
 function getChromeSpawnHelperPath(): string {
     if (path.basename(__dirname) === 'src') {
         // For tests
diff --git a/test/chromeDebugAdapter.test.ts b/test/chromeDebugAdapter.test.ts
index 74608d9..ff55c5e 100644
--- a/test/chromeDebugAdapter.test.ts
+++ b/test/chromeDebugAdapter.test.ts
@@ -138,7 +138,7 @@ suite('ChromeDebugAdapter', () => {
                 { '/src': WEBROOT + '/app/src' });
             assert.deepEqual(
                 resolveWebRootPattern(WEBROOT, <ISourceMapPathOverrides>{ '${webRoot}/src': '${webRoot}/app/src'}),
-                { WEBROOT + '/src': WEBROOT + '/app/src' });
+                { [WEBROOT + '/src']:  WEBROOT + '/app/src'});
         });
 
         test(`ignores the webRoot pattern when it's not at the beginning of the string`, () => {
@@ -162,7 +162,7 @@ suite('ChromeDebugAdapter', () => {
                 '*/app.js': '*/app.js',
                 '/src/app.js': '/src/${webRoot}',
                 '/app.js': WEBROOT + '/app.js',
-                WEBROOT + '/app1.js': WEBROOT + '/app.js'
+                [WEBROOT + '/app1.js']: WEBROOT + '/app.js'
             };
 
             assert.deepEqual(