diff --git a/src/idiomorph.js b/src/idiomorph.js
index 2ce60c6..f78733f 100644
--- a/src/idiomorph.js
+++ b/src/idiomorph.js
@@ -535,26 +535,6 @@ var Idiomorph = (function () {
       return cursor;
     }
 
-    /**
-     * @param {Node | null} node - node being removed from consideration
-     * @param {string} id - The ID of the element to be moved.
-     * @param {MorphContext} ctx
-     */
-    function removeIdFromMap(node, id, ctx) {
-      while (node) {
-        let idSet = ctx.idMap.get(node);
-        if(idSet) {
-          idSet?.delete(id);
-          if (idSet.size == 0) {
-            ctx.idMap.delete(node)
-          } else {
-            ctx.idMap.set(node,idSet);
-          }
-        }
-        node = node.parentNode;
-      }
-    }
-
     /**
      * Search for an element by id within the document and pantry, and move it using moveBefore.
      *