diff --git a/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs b/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
index 81fc1510ab0a6..053c9035d8cce 100644
--- a/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
+++ b/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
@@ -8457,7 +8457,8 @@ private TypeWithState VisitUserDefinedConversion(
             bool reportRemainingWarnings,
             Location diagnosticLocation)
         {
-            Debug.Assert(!IsConditionalState);
+            // Uncomment when https://github.com/dotnet/roslyn/issues/67153 is fixed
+            // Debug.Assert(!IsConditionalState);
             Debug.Assert(conversionOperand != null);
             Debug.Assert(targetTypeWithNullability.HasType);
             Debug.Assert(diagnosticLocation != null);