1 files changed, 1 insertions, 0 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 3e70f2eb..fb5bcb74 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -10118,6 +10118,7 @@ merge(Compressor.prototype, {
             }
             if (found && !generated && typeof key == "string" && /^[0-9]+$/.test(key)) {
                 generated = true;
+                if (keys.has(key)) prop = keys.get(key)[0];
                 prop.key = make_node(AST_Number, prop, {
                     value: +key
                 });