diff --git a/lib/compress.js b/lib/compress.js
index 68471a5e..6fdf8f2d 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -320,6 +320,7 @@ merge(Compressor.prototype, {
                             if (node instanceof AST_Lambda
                                 || node instanceof AST_Try
                                 || node instanceof AST_With
+                                || node instanceof AST_Case
                                 || node instanceof AST_IterationStatement
                                 || (parent instanceof AST_If          && node !== parent.condition)
                                 || (parent instanceof AST_Conditional && node !== parent.condition)