diff --git a/lib/compress.js b/lib/compress.js
index 7d1f8cc3..e59dce63 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4655,6 +4655,7 @@ merge(Compressor.prototype, {
         var arg_index;
         if (consequent instanceof AST_Call
             && alternative.TYPE === consequent.TYPE
+            && consequent.args.length > 0
             && consequent.args.length == alternative.args.length
             && consequent.expression.equivalent_to(alternative.expression)
             && !self.condition.has_side_effects(compressor)