diff --git a/src/services/jsDoc.ts b/src/services/jsDoc.ts
index f5629d9a63a..8db851e3eb4 100644
--- a/src/services/jsDoc.ts
+++ b/src/services/jsDoc.ts
@@ -166,9 +166,9 @@ namespace ts.JsDoc {
         const lineStart = sourceFile.getLineStarts()[posLineAndChar.line];
 
         const indentationStr = sourceFile.text.substr(lineStart, posLineAndChar.character);
+        const isJavaScriptFile = hasJavaScriptFileExtension(sourceFile.fileName); // JSX or JS file
 
         let docParams = "";
-        let isJavaScriptFile = hasJavaScriptFileExtension(sourceFile.fileName); // JSX or JS file
         for (let i = 0, numParams = parameters.length; i < numParams; i++) {
             const currentName = parameters[i].name;
             const paramName = currentName.kind === SyntaxKind.Identifier ?