diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index abba2692865..e842f008bbe 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -3160,7 +3160,7 @@ namespace ts {
                 if (declaration.kind === SyntaxKind.ExportAssignment) {
                     return links.type = checkExpression((<ExportAssignment>declaration).expression);
                 }
-                if (declaration.kind === SyntaxKind.JSDocPropertyTag && (<JSDocPropertyTag>declaration).typeExpression) {
+                if (declaration.flags & NodeFlags.JavaScriptFile && declaration.kind === SyntaxKind.JSDocPropertyTag && (<JSDocPropertyTag>declaration).typeExpression) {
                     return links.type = getTypeFromTypeNode((<JSDocPropertyTag>declaration).typeExpression.type);
                 }
                 // Handle variable, parameter or property