1 files changed, 1 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 64178227..89056796 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1746,7 +1746,7 @@ merge(Compressor.prototype, {
                 }
                 if (prop instanceof AST_Node) break;
                 def.value.properties.push(make_node(AST_ObjectKeyVal, node, {
-                    key: prop,
+                    key: "" + prop,
                     value: node.right
                 }));
                 exprs.shift();