diff --git a/lib/compress.js b/lib/compress.js
index a3a930f2..f426cf02 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6559,7 +6559,7 @@ Compressor.prototype.compress = function(node) {
                 });
                 return true;
             }
-            if (node instanceof AST_SymbolConst || node instanceof AST_SymbolLet) {
+            if (node instanceof AST_SymbolDeclaration) {
                 references[node.definition().id] = false;
                 return true;
             }
diff --git a/test/ufuzz/index.js b/test/ufuzz/index.js
index 9c676c95..52a8f3ba 100644
--- a/test/ufuzz/index.js
+++ b/test/ufuzz/index.js
@@ -2494,6 +2494,7 @@ function patch_try_catch(orig, toplevel) {
 var beautify_options = {
     compress: false,
     mangle: false,
+    module: false,
     output: {
         beautify: true,
         braces: true,