diff --git a/src/main/java/org/apache/commons/pool2/impl/SecurityManagerCallStack.java b/src/main/java/org/apache/commons/pool2/impl/SecurityManagerCallStack.java
index 24aa014..12a9279 100644
--- a/src/main/java/org/apache/commons/pool2/impl/SecurityManagerCallStack.java
+++ b/src/main/java/org/apache/commons/pool2/impl/SecurityManagerCallStack.java
@@ -52,7 +52,7 @@
     public SecurityManagerCallStack(final String messageFormat, final boolean useTimestamp) {
         this.messageFormat = messageFormat;
         this.dateFormat = useTimestamp ? new SimpleDateFormat(messageFormat) : null;
-        this.securityManager = AccessController.doPrivileged((PrivilegedAction<PrivateSecurityManager>) () -> new PrivateSecurityManager());
+        this.securityManager = AccessController.doPrivileged((PrivilegedAction<PrivateSecurityManager>) PrivateSecurityManager::new);
     }
 
     @Override