diff --git a/server/lib/src/constants/entries.rs b/server/lib/src/constants/entries.rs
index 03ebbd972..5f404ca44 100644
--- a/server/lib/src/constants/entries.rs
+++ b/server/lib/src/constants/entries.rs
@@ -1,8 +1,9 @@
 //! Constant Entries for the IDM
-use crate::prelude::{idm_builtin_admin_groups, AttrString};
+use crate::prelude::AttrString;
 use enum_iterator::Sequence;
 use std::fmt::Display;
 
+use crate::constants::groups::idm_builtin_admin_groups;
 use crate::constants::uuids::*;
 use crate::entry::{Entry, EntryInit, EntryInitNew, EntryNew};
 use crate::idm::account::Account;
diff --git a/server/lib/src/server/access/delete.rs b/server/lib/src/server/access/delete.rs
index 916cdb962..52fc319b3 100644
--- a/server/lib/src/server/access/delete.rs
+++ b/server/lib/src/server/access/delete.rs
@@ -162,14 +162,18 @@ fn protected_filter_entry(ident: &Identity, entry: &Arc<EntrySealedCommitted>) -
                 if classes.contains(&EntryClass::SyncObject.into()) {
                     // Block the mod
                     security_access!("attempt to delete with protected class type");
-                    IResult::Denied
-                } else {
-                    IResult::Ignore
+                    return IResult::Denied;
                 }
-            } else {
-                // Nothing to check.
-                IResult::Ignore
+            };
+
+            // Prevent deletion of entries that exist in the system controlled entry range.
+            if entry.get_uuid() <= UUID_ANONYMOUS {
+                security_access!("attempt to delete system builtin entry");
+                return IResult::Denied;
             }
+
+            // Checks exhausted, no more input from us
+            IResult::Ignore
         }
     }
 }
diff --git a/server/lib/src/server/access/mod.rs b/server/lib/src/server/access/mod.rs
index ec842ff56..70ae52fdd 100644
--- a/server/lib/src/server/access/mod.rs
+++ b/server/lib/src/server/access/mod.rs
@@ -3118,4 +3118,30 @@ mod tests {
         // Test reject delete
         test_acp_delete!(&de_b, vec![acp], &data_set, false);
     }
+
+    #[test]
+    fn test_access_delete_protect_system_ranges() {
+        let ev1: EntryInitNew = BUILTIN_ACCOUNT_ANONYMOUS_V1.clone().into();
+        let ev1 = ev1.into_sealed_committed();
+        let r_set = vec![Arc::new(ev1)];
+
+        let de_account = DeleteEvent::new_impersonate_entry(
+            E_TEST_ACCOUNT_1.clone(),
+            filter_all!(f_eq(
+                Attribute::Name,
+                PartialValue::new_iname("testperson1")
+            )),
+        );
+
+        let acp = AccessControlDelete::from_raw(
+            "test_delete",
+            Uuid::new_v4(),
+            UUID_TEST_GROUP_1,
+            // To delete testperson
+            filter_valid!(f_eq(Attribute::Name, PartialValue::new_iname("anonymous"))),
+        );
+
+        // Test reject delete, can not delete due to system protection
+        test_acp_delete!(&de_account, vec![acp], &r_set, false);
+    }
 }