diff --git a/tests/performance/compare-results.js b/tests/performance/compare-results.js
index aea827b511..9cb190c1e4 100644
--- a/tests/performance/compare-results.js
+++ b/tests/performance/compare-results.js
@@ -28,14 +28,14 @@ const testSuites = [ 'home-block-theme', 'home-classic-theme' ];
 // The current commit's results.
 const testResults = Object.fromEntries(
 	testSuites
-		.filter( ( key ) => fs.existsSync( `${ key }.test.results.json` ) )
+		.filter( ( key ) => fs.existsSync( path.join( __dirname, '/specs/', `${ key }.test.results.json` ) ) )
 		.map( ( key ) => [ key, parseFile( `${ key }.test.results.json` ) ] )
 );
 
 // The previous commit's results.
 const prevResults = Object.fromEntries(
 	testSuites
-		.filter( ( key ) => fs.existsSync( `before-${ key }.test.results.json` ) )
+		.filter( ( key ) => fs.existsSync( path.join( __dirname, '/specs/', `before-${ key }.test.results.json` ) ) )
 		.map( ( key ) => [ key, parseFile( `before-${ key }.test.results.json` ) ] )
 );