diff --git a/build/lib/tsb/builder.js b/build/lib/tsb/builder.js
index b329dd1cc08..84308191361 100644
--- a/build/lib/tsb/builder.js
+++ b/build/lib/tsb/builder.js
@@ -618,7 +618,7 @@ class LanguageServiceHost {
         });
         // (2) import-require statements
         info.importedFiles.forEach(ref => {
-            if (!ref.fileName.startsWith('.') || path_1.default.extname(ref.fileName) === '') {
+            if (!ref.fileName.startsWith('.')) {
                 // node module?
                 return;
             }
diff --git a/build/lib/tsb/builder.ts b/build/lib/tsb/builder.ts
index c32753ee6ea..7a1b0e0cbb4 100644
--- a/build/lib/tsb/builder.ts
+++ b/build/lib/tsb/builder.ts
@@ -702,7 +702,7 @@ class LanguageServiceHost implements ts.LanguageServiceHost {
 		// (2) import-require statements
 		info.importedFiles.forEach(ref => {
 
-			if (!ref.fileName.startsWith('.') || path.extname(ref.fileName) === '') {
+			if (!ref.fileName.startsWith('.')) {
 				// node module?
 				return;
 			}