diff --git a/ICSharpCode.Decompiler/IL/Instructions/CompoundAssignmentInstruction.cs b/ICSharpCode.Decompiler/IL/Instructions/CompoundAssignmentInstruction.cs
index ab6c10f6f..1c9753620 100644
--- a/ICSharpCode.Decompiler/IL/Instructions/CompoundAssignmentInstruction.cs
+++ b/ICSharpCode.Decompiler/IL/Instructions/CompoundAssignmentInstruction.cs
@@ -56,7 +56,7 @@ namespace ICSharpCode.Decompiler.IL
 		}
 	}
 
-	public partial class NumericCompoundAssign : CompoundAssignmentInstruction
+	public partial class NumericCompoundAssign : CompoundAssignmentInstruction, ILiftableInstruction
 	{
 		/// <summary>
 		/// Gets whether the instruction checks for overflow.
@@ -195,13 +195,12 @@ namespace ICSharpCode.Decompiler.IL
 	public partial class UserDefinedCompoundAssign : CompoundAssignmentInstruction
 	{
 		public readonly IMethod Method;
-		public readonly bool IsLifted;
+		public bool IsLifted => false; // TODO: implement ILi
 
-		public UserDefinedCompoundAssign(IMethod method, CompoundAssignmentType compoundAssignmentType, ILInstruction target, ILInstruction value, bool isLifted)
+		public UserDefinedCompoundAssign(IMethod method, CompoundAssignmentType compoundAssignmentType, ILInstruction target, ILInstruction value)
 			: base(OpCode.UserDefinedCompoundAssign, compoundAssignmentType, target, value)
 		{
 			this.Method = method;
-			this.IsLifted = isLifted;
 			Debug.Assert(Method.IsOperator);
 			Debug.Assert(compoundAssignmentType == CompoundAssignmentType.EvaluatesToNewValue || (Method.Name == "op_Increment" || Method.Name == "op_Decrement"));
 			Debug.Assert(IsValidCompoundAssignmentTarget(Target));
diff --git a/ICSharpCode.Decompiler/IL/Transforms/TransformAssignment.cs b/ICSharpCode.Decompiler/IL/Transforms/TransformAssignment.cs
index c7e4a8bc7..25a398df8 100644
--- a/ICSharpCode.Decompiler/IL/Transforms/TransformAssignment.cs
+++ b/ICSharpCode.Decompiler/IL/Transforms/TransformAssignment.cs
@@ -292,7 +292,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 					return false; // TODO: add tests and think about whether nullables need special considerations
 				context.Step($"Compound assignment (user-defined binary)", compoundStore);
 				newInst = new UserDefinedCompoundAssign(operatorCall.Method, CompoundAssignmentType.EvaluatesToNewValue,
-					operatorCall.Arguments[0], rhs, operatorCall.IsLifted);
+					operatorCall.Arguments[0], rhs);
 			} else {
 				return false;
 			}
@@ -539,7 +539,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 			} else {
 				Call operatorCall = (Call)value;
 				block.Instructions[pos] = new StLoc(stloc.Variable, new UserDefinedCompoundAssign(
-					operatorCall.Method, CompoundAssignmentType.EvaluatesToOldValue, stloc.Value, new LdcI4(1), operatorCall.IsLifted));
+					operatorCall.Method, CompoundAssignmentType.EvaluatesToOldValue, stloc.Value, new LdcI4(1)));
 			}
 			return true;
 		}
@@ -587,7 +587,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 					return false; // TODO: add tests and think about whether nullables need special considerations
 				context.Step("TransformPostIncDecOperator (user-defined)", inst);
 				inst.Value = new UserDefinedCompoundAssign(operatorCall.Method,
-					CompoundAssignmentType.EvaluatesToOldValue, inst.Value, new LdcI4(1), operatorCall.IsLifted);
+					CompoundAssignmentType.EvaluatesToOldValue, inst.Value, new LdcI4(1));
 			} else {
 				return false;
 			}