diff --git a/lib/compress.js b/lib/compress.js
index 6e766fb0..7c60b763 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -693,7 +693,7 @@ merge(Compressor.prototype, {
         return node instanceof AST_SymbolRef && node.definition().undeclared;
     }
 
-    var global_names = makePredicate("Array Boolean console Error Function Math Number RegExp Object String");
+    var global_names = makePredicate("Array Boolean console Date Error Function Math Number RegExp Object String");
     AST_SymbolRef.DEFMETHOD("is_declared", function(compressor) {
         return !this.definition().undeclared
             || compressor.option("unsafe") && global_names(this.name);
diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js
index abf5297c..bee7994e 100644
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -241,6 +241,7 @@ issue_2233_1: {
         Array.isArray;
         Boolean;
         console.log;
+        Date;
         Error.name;
         Function.length;
         Math.random;