diff --git a/lib/compress.js b/lib/compress.js
index 08b0f0d1..18467909 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6342,7 +6342,7 @@ merge(Compressor.prototype, {
                             } else if (trim) {
                                 log(sym.name, "Dropping unused default argument {name}");
                                 argnames.pop();
-                            } else if (i > default_length) {
+                            } else if (i >= default_length) {
                                 log(sym.name, "Dropping unused default argument assignment {name}");
                                 sym.name.__unused = true;
                                 argnames[i] = sym.name;