diff --git a/InputBox.classes.php b/InputBox.classes.php
index 1b34519b..be424ac1 100644
--- a/InputBox.classes.php
+++ b/InputBox.classes.php
@@ -333,8 +333,8 @@ class InputBox {
 			'action' => $wgScript,
 			'method' => 'get'
 		);
-		if( isset( $this->mId ) ) {
-			$createBoxParams['id'] = Sanitizer::escapeId( $this->mId );
+		if( $this->mID !== '' ) {
+			$createBoxParams['id'] = Sanitizer::escapeId( $this->mID );
 		}
 		$htmlOut .= Xml::openElement( 'form', $createBoxParams );
 		$htmlOut .= Xml::openElement( 'input',
@@ -515,8 +515,8 @@ class InputBox {
 			'action' => $wgScript,
 			'method' => 'get'
 		);
-		if( isset( $this->mId ) ) {
-			$commentFormParams['id'] = Sanitizer::escapeId( $this->mId );
+		if( $this->mID !== '' ) {
+			$commentFormParams['id'] = Sanitizer::escapeId( $this->mID );
 		}
 		$htmlOut .= Xml::openElement( 'form', $commentFormParams );
 		$htmlOut .= Xml::openElement( 'input',