diff --git a/java/org/apache/catalina/security/SecurityClassLoad.java b/java/org/apache/catalina/security/SecurityClassLoad.java
index 45b2b88f68..1821695cfc 100644
--- a/java/org/apache/catalina/security/SecurityClassLoad.java
+++ b/java/org/apache/catalina/security/SecurityClassLoad.java
@@ -149,6 +149,7 @@ public final class SecurityClassLoad {
         loader.loadClass(basePackage + "CoyoteInputStream$PrivilegedRead");
         loader.loadClass(basePackage + "CoyoteInputStream$PrivilegedReadArray");
         loader.loadClass(basePackage + "CoyoteInputStream$PrivilegedReadBuffer");
+        loader.loadClass(basePackage + "CoyoteOutputStream");
         loader.loadClass(basePackage + "InputBuffer$PrivilegedCreateConverter");
         loader.loadClass(basePackage + "Response$PrivilegedDoIsEncodable");
         loader.loadClass(basePackage + "Response$PrivilegedGenerateCookieString");