--- a/External/FEXCore/Source/Utils/Allocator/IntrusiveArenaAllocator.h
+++ b/External/FEXCore/Source/Utils/Allocator/IntrusiveArenaAllocator.h
@@ -7,10 +7,15 @@
 
 #include <bitset>
 #include <cstddef>
-#include <memory_resource>
+#include <experimental/list>
+#include <experimental/memory_resource>
 #include <mutex>
 #include <vector>
 
+namespace std {
+  namespace pmr = experimental::pmr;
+}
+
 namespace Alloc {
   class ForwardOnlyIntrusiveArenaAllocator final : public std::pmr::memory_resource {
   public: