diff --git a/types/libxmljs/index.d.ts b/types/libxmljs/index.d.ts
index db37035f06..5ba3fc294f 100644
--- a/types/libxmljs/index.d.ts
+++ b/types/libxmljs/index.d.ts
@@ -116,6 +116,7 @@ export class Element extends Node {
     prevElement(): Element|null;
     nextElement(): Element|null;
     addNextSibling(siblingNode: Node): Node;
+    addPrevSibling(siblingNode: Node): Node;
 
     find(xpath: string, ns_uri?: string): Node[];
     find(xpath: string, namespaces: StringMap): Node[];