1 files changed, 5 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 4f5e9253..5509137b 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4931,7 +4931,11 @@ merge(Compressor.prototype, {
             if (def.single_use) return;
             if (top_retain(def)) return;
             if (sym.fixed_value() !== right) return;
-            return right instanceof AST_Object && right.properties.length > 0;
+            return right instanceof AST_Object
+                && right.properties.length > 0
+                && all(right.properties, function(prop) {
+                    return prop instanceof AST_ObjectKeyVal;
+                });
         }
     });