diff --git a/src/classes.js b/src/classes.js
index d5ded1e4..9fac5a8e 100644
--- a/src/classes.js
+++ b/src/classes.js
@@ -143,7 +143,7 @@ export class Pronoun {
     }
 
     clone() {
-        return new Pronoun(this.canonicalName, this.description, this.normative, clone(this.morphemes), this.plural, this.pluralHonorific);
+        return new Pronoun(this.canonicalName, this.description, this.normative, clone(this.morphemes), [...this.plural], [...this.pluralHonorific]);
     }
 
     equals(other) {