diff --git a/babel-plugin-expose-private-functions-and-variables.js b/babel-plugin-expose-private-functions-and-variables.js
index f0807e3397..41ad501fa5 100644
--- a/babel-plugin-expose-private-functions-and-variables.js
+++ b/babel-plugin-expose-private-functions-and-variables.js
@@ -80,6 +80,14 @@ module.exports = function ({types: t}) {
 						)
 					);
 
+					// replace all private function calls to window.x.x.x._._func()
+					path.traverse({
+						CallExpression(callPath) {
+							const callee = callPath.node.callee;
+							if (t.isIdentifier(callee) && exports[callee.name])
+								callPath.node.callee = createNestedMemberExpression([exports[callee.name], ...dir]);
+						}
+					});
 				}
 			}
 		}
diff --git a/zkdoc/release-note b/zkdoc/release-note
index 49005a5fd1..5e210b9a91 100644
--- a/zkdoc/release-note
+++ b/zkdoc/release-note
@@ -31,6 +31,7 @@ ZK 10.1.0
   ZK-5798: Client MVVM: Content missing in Include
   ZK-5799: Javascript error when using Pdfviewer in Client MVVM
   ZK-5801: Client MVVM: switching apply template causing javascript error
+  ZK-5802: _listenFlex, _unlistenFlex declared on static member _ are used directly, cannot be overriden
 
 * Upgrade Notes
   + Remove Htmls.encodeJavaScript(), Strings.encodeJavaScript(), Strings.escape() with Strings.ESCAPE_JAVASCRIPT, and replace them with OWASP Java Encoder APIs instead.