1 files changed, 4 insertions, 1 deletions
diff --git a/source/slang/slang-ir-util.cpp b/source/slang/slang-ir-util.cpp
index 7775fdb91..1f13eb754 100644
--- a/source/slang/slang-ir-util.cpp
+++ b/source/slang/slang-ir-util.cpp
@@ -53,7 +53,10 @@ bool isComInterfaceType(IRType* type)
     {
         return true;
     }
-
+    if (auto witnessTableType = as<IRWitnessTableTypeBase>(type))
+    {
+        return isComInterfaceType((IRType*)witnessTableType->getConformanceType());
+    }
     if (auto ptrType = as<IRNativePtrType>(type))
     {
         auto valueType = ptrType->getValueType();