diff --git a/csharp/ql/lib/semmle/code/csharp/security/dataflow/ZipSlipQuery.qll b/csharp/ql/lib/semmle/code/csharp/security/dataflow/ZipSlipQuery.qll
index a59b355feb4..5d5e9016c18 100644
--- a/csharp/ql/lib/semmle/code/csharp/security/dataflow/ZipSlipQuery.qll
+++ b/csharp/ql/lib/semmle/code/csharp/security/dataflow/ZipSlipQuery.qll
@@ -49,13 +49,6 @@
    }
  }
  
- /**
-  * DEPRECATED: Use `Sanitizer` instead.
-  *
-  * A guard for unsafe zip extraction.
-  */
- abstract deprecated class SanitizerGuard extends DataFlow::BarrierGuard { }
- 
  /**
   * DEPRECATED: Use `ZipSlip` instead.
   *
@@ -69,10 +62,6 @@
    override predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
  
    override predicate isSanitizer(DataFlow::Node node) { node instanceof Sanitizer }
- 
-   deprecated override predicate isSanitizerGuard(DataFlow::BarrierGuard guard) {
-     guard instanceof SanitizerGuard
-   }
  }
  
  /**
@@ -486,4 +475,4 @@
  
    override predicate isSanitizer(DataFlow::Node node) { node instanceof Sanitizer }
  }
- 
\ No newline at end of file
+