249b79
@@ -36,7 +36,7 @@
import java.util.Map;
 @SuppressWarnings("serial")
 public class LinkedCaseInsensitiveMap<V> extends LinkedHashMap<String, V> {
 
-	private final Map<String, String> caseInsensitiveKeys;
+	private Map<String, String> caseInsensitiveKeys;
 
 	private final Locale locale;
 
@@ -151,6 +151,14 @@
public class LinkedCaseInsensitiveMap<V> extends LinkedHashMap<String, V> {
 		super.clear();
 	}
 
+	@Override
+	@SuppressWarnings("unchecked")
+	public Object clone() {
+		LinkedCaseInsensitiveMap<V> copy = (LinkedCaseInsensitiveMap<V>) super.clone();
+		copy.caseInsensitiveKeys = new HashMap<>(this.caseInsensitiveKeys);
+		return copy;
+	}
+
 
 	/**
 	 * Convert the given key to a case-insensitive key.
