diff --git a/clang/lib/CIR/CodeGen/CIRGenClass.cpp b/clang/lib/CIR/CodeGen/CIRGenClass.cpp
index 3539dd969970..a55d67dbe146 100644
--- a/clang/lib/CIR/CodeGen/CIRGenClass.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenClass.cpp
@@ -1480,6 +1480,8 @@ mlir::Value CIRGenFunction::getVTablePtr(SourceLocation Loc, Address This,
 Address CIRGenFunction::buildCXXMemberDataPointerAddress(
     const Expr *E, Address base, mlir::Value memberPtr,
     const MemberPointerType *memberPtrType, LValueBaseInfo *baseInfo) {
+  assert(!UnimplementedFeature::cxxABI());
+
   auto op = builder.createGetIndirectMember(getLoc(E->getSourceRange()),
                                             base.getPointer(), memberPtr);
 
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprConst.cpp b/clang/lib/CIR/CodeGen/CIRGenExprConst.cpp
index d6c88e0cfb6e..cc64c2658ec4 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprConst.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprConst.cpp
@@ -1533,6 +1533,8 @@ mlir::Attribute ConstantEmitter::tryEmitPrivate(const APValue &Value,
                               Elts, typedFiller);
   }
   case APValue::MemberPointer: {
+    assert(!UnimplementedFeature::cxxABI());
+
     const ValueDecl *memberDecl = Value.getMemberPointerDecl();
     assert(!Value.isMemberPointerToDerivedMember() && "NYI");
 
@@ -1584,6 +1586,8 @@ mlir::Value CIRGenModule::buildNullConstant(QualType T, mlir::Location loc) {
 }
 
 mlir::Value CIRGenModule::buildMemberPointerConstant(const UnaryOperator *E) {
+  assert(!UnimplementedFeature::cxxABI());
+
   auto loc = getLoc(E->getSourceRange());
   auto ty = getCIRType(E->getType()).cast<mlir::cir::MemberPtrType>();