diff --git a/libASL/symbolic.ml b/libASL/symbolic.ml
index a904fcfb..a999a19c 100644
--- a/libASL/symbolic.ml
+++ b/libASL/symbolic.ml
@@ -990,6 +990,10 @@ let prims_impure () =
     FIdent("AtomicEnd",0);
     FIdent("AArch64.MemTag.read",0);
     FIdent("AArch64.MemTag.set",0);
+    FIdent("SetTagCheckedInstruction",0);
+    FIdent("SpeculativeStoreBypassBarrierToPA",0);
+    FIdent("SpeculationBarrier",0);
+    FIdent("SpeculativeStoreBypassBarrierToVA",0);
   ]
 
 (** Test if an expression is only over constants, variables and pure operations. Does not
diff --git a/libASL/symbolic_lifter.ml b/libASL/symbolic_lifter.ml
index 86dd03b4..af56c66c 100644
--- a/libASL/symbolic_lifter.ml
+++ b/libASL/symbolic_lifter.ml
@@ -135,9 +135,12 @@ module RemoveUnsupported = struct
       | Stmt_Dep_ImpDef (_, loc)
       | Stmt_See (_, loc)
       | Stmt_Throw (_, loc)
+      | Stmt_Repeat(_, _, loc)
+      | Stmt_Try(_, _, _, _, loc)
       | Stmt_DecodeExecute (_, _, loc) -> ChangeTo (assert_false loc)
 
-      | _ -> failwith @@ "Unknown stmt: " ^ (pp_stmt e))
+      )
+
   end
 
   let run unsupported env body =