diff --git a/build/lib/tsb/builder.js b/build/lib/tsb/builder.js
index fc74bfa8acc63..e097b91a3ea0a 100644
--- a/build/lib/tsb/builder.js
+++ b/build/lib/tsb/builder.js
@@ -550,7 +550,10 @@ class LanguageServiceHost {
             let found = false;
             while (!found && dirname.indexOf(stopDirname) === 0) {
                 dirname = path.dirname(dirname);
-                const resolvedPath = path.resolve(dirname, ref.fileName);
+                let resolvedPath = path.resolve(dirname, ref.fileName);
+                if (resolvedPath.endsWith('.js')) {
+                    resolvedPath = resolvedPath.slice(0, -3);
+                }
                 const normalizedPath = normalize(resolvedPath);
                 if (this.getScriptSnapshot(normalizedPath + '.ts')) {
                     this._dependencies.inertEdge(filename, normalizedPath + '.ts');
diff --git a/build/lib/tsb/builder.ts b/build/lib/tsb/builder.ts
index 9fc476ae7020b..8aa277a8a822f 100644
--- a/build/lib/tsb/builder.ts
+++ b/build/lib/tsb/builder.ts
@@ -660,7 +660,10 @@ class LanguageServiceHost implements ts.LanguageServiceHost {
 
 			while (!found && dirname.indexOf(stopDirname) === 0) {
 				dirname = path.dirname(dirname);
-				const resolvedPath = path.resolve(dirname, ref.fileName);
+				let resolvedPath = path.resolve(dirname, ref.fileName);
+				if (resolvedPath.endsWith('.js')) {
+					resolvedPath = resolvedPath.slice(0, -3);
+				}
 				const normalizedPath = normalize(resolvedPath);
 
 				if (this.getScriptSnapshot(normalizedPath + '.ts')) {