diff --git a/lib/resources/powerpacks.js b/lib/resources/powerpacks.js
index cca22ce..71c9cac 100644
--- a/lib/resources/powerpacks.js
+++ b/lib/resources/powerpacks.js
@@ -99,8 +99,12 @@ export class Powerpack extends PlivoResource {
 		return super.customexecuteAction(path.toString().trim(), 'POST', params);
 	}
 	remove_number(number, unrent = false) {
-		var params;
-		params['unrent'] = unrent;
+    var params = {};
+		if (typeof unrent === 'boolean') {
+			params['unrent'] = unrent.toString();
+		} else {
+			params['unrent'] = unrent;
+		}
 		let path = 'NumberPool/' + this.number_pool_id + '/Number/' + number + '/';
 		return super.customexecuteAction(path.toString().trim(), 'DELETE', params);
 	}
@@ -281,8 +285,12 @@ export class Numbers extends PlivoResource {
 		return super.customexecuteAction(path.toString().trim(), 'POST', params);
 	}
 	remove(number, unrent = false) {
-		var params;
-		params['unrent'] = unrent;
+		var params = {};
+		if (typeof unrent === 'boolean') {
+			params['unrent'] = unrent.toString();
+		} else {
+			params['unrent'] = unrent;
+		}
 		let path = 'NumberPool/' + this.number_pool_id + '/Number/' + number + '/';
 		return super.customexecuteAction(path.toString().trim(), 'DELETE', params);
 	}