1 files changed, 1 insertions, 2 deletions
diff --git a/src/tools/fuzzing/heap-types.cpp b/src/tools/fuzzing/heap-types.cpp
index c1c13bc0a..7eaf23701 100644
--- a/src/tools/fuzzing/heap-types.cpp
+++ b/src/tools/fuzzing/heap-types.cpp
@@ -759,8 +759,7 @@ void Inhabitator::markExternRefsNullable() {
     auto children = type.getTypeChildren();
     for (size_t i = 0; i < children.size(); ++i) {
       auto child = children[i];
-      if (child.isRef() && child.getHeapType().isBasic() &&
-          child.getHeapType().getBasic(Unshared) == HeapType::ext &&
+      if (child.isRef() && child.getHeapType().isMaybeShared(HeapType::ext) &&
           child.isNonNullable()) {
         markNullable({type, i});
       }