diff --git a/leshan-client-core/src/main/java/org/eclipse/leshan/client/servers/BootstrapHandler.java b/leshan-client-core/src/main/java/org/eclipse/leshan/client/servers/BootstrapHandler.java
index 58ff449e2f..bf3e0c6552 100644
--- a/leshan-client-core/src/main/java/org/eclipse/leshan/client/servers/BootstrapHandler.java
+++ b/leshan-client-core/src/main/java/org/eclipse/leshan/client/servers/BootstrapHandler.java
@@ -83,8 +83,8 @@ public synchronized BootstrapDeleteResponse delete(Identity identity, BootstrapD
             // Delete all security instance (except bootstrap one)
             // TODO do not delete boostrap server (see 5.2.5.2 Bootstrap Delete)
             LwM2mObjectEnabler securityObject = objects.get(SECURITY);
-            for (Integer instanceId : serverObject.getAvailableInstanceIds()) {
-                securityObject.delete(identity, new DeleteRequest(SERVER, instanceId));
+            for (Integer instanceId : securityObject.getAvailableInstanceIds()) {
+                securityObject.delete(identity, new DeleteRequest(SECURITY, instanceId));
             }
 
             return BootstrapDeleteResponse.success();