diff --git a/ApiVisualEditor.php b/ApiVisualEditor.php
index f5200df676..901aa52de2 100644
--- a/ApiVisualEditor.php
+++ b/ApiVisualEditor.php
@@ -28,9 +28,11 @@ class ApiVisualEditor extends ApiBase {
 	}
 
 	protected function postHTML( $title, $html ) {
-		global $wgVisualEditorParsoidURL, $wgVisualEditorParsoidTimeout;
+		global $wgVisualEditorParsoidURL, $wgVisualEditorParsoidPrefix,
+			$wgVisualEditorParsoidTimeout;
 		return Http::post(
-			$wgVisualEditorParsoidURL . '/' . urlencode( $title->getPrefixedDBkey() ),
+			$wgVisualEditorParsoidURL . '/' . $wgVisualEditorParsoidPrefix .
+				'/' . urlencode( $title->getPrefixedDBkey() ),
 			array(
 				'postData' => array( 'content' => $html ),
 				'timeout' => $wgVisualEditorParsoidTimeout