diff --git a/include/vast/CodeGen/DefaultAttrVisitor.hpp b/include/vast/CodeGen/DefaultAttrVisitor.hpp
index 37b6c1c5f3..e41fc8585d 100644
--- a/include/vast/CodeGen/DefaultAttrVisitor.hpp
+++ b/include/vast/CodeGen/DefaultAttrVisitor.hpp
@@ -26,8 +26,10 @@ namespace vast::cg {
 
         mlir_attr VisitConstAttr(const clang::ConstAttr *attr);
         mlir_attr VisitSectionAttr(const clang::SectionAttr *attr);
+        mlir_attr VisitTargetAttr(const clang::TargetAttr *attr);
         mlir_attr VisitAliasAttr(const clang::AliasAttr *attr);
         mlir_attr VisitErrorAttr(const clang::ErrorAttr *attr);
+        mlir_attr VisitFlattenAttr(const clang::FlattenAttr *attr);
         mlir_attr VisitFormatAttr(const clang::FormatAttr *attr);
         mlir_attr VisitFormatArgAttr(const clang::FormatArgAttr *attr);
         mlir_attr VisitAnnotateAttr(const clang::AnnotateAttr *attr);
diff --git a/lib/vast/CodeGen/DefaultAttrVisitor.cpp b/lib/vast/CodeGen/DefaultAttrVisitor.cpp
index 4300b85a26..a7d98ffcb2 100644
--- a/lib/vast/CodeGen/DefaultAttrVisitor.cpp
+++ b/lib/vast/CodeGen/DefaultAttrVisitor.cpp
@@ -14,6 +14,10 @@ namespace vast::cg
         return make< hl::SectionAttr >(attr->getName());
     }
 
+    mlir_attr default_attr_visitor::VisitTargetAttr(const clang::TargetAttr *attr) {
+        return make< hl::TargetAttr >(attr->getFeaturesStr());
+    }
+
     mlir_attr default_attr_visitor::VisitAliasAttr(const clang::AliasAttr *attr) {
         return make< hl::AliasAttr >(attr->getAliasee());
     }
@@ -22,6 +26,10 @@ namespace vast::cg
         return make< hl::ErrorAttr >(attr->getUserDiagnostic());
     }
 
+    mlir_attr default_attr_visitor::VisitFlattenAttr(const clang::FlattenAttr *attr) {
+        return make< hl::FlattenAttr >();
+    }
+
     mlir_attr default_attr_visitor::VisitFormatAttr(const clang::FormatAttr *attr) {
         return make< hl::FormatAttr >(attr->getType()->getName());
     }