diff --git a/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp b/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp
index d97d0e5856..e147800370 100644
--- a/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp
+++ b/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp
@@ -190,6 +190,7 @@ hsa_status_t MemoryRegion::AllocateImpl(size_t& size, AllocateFlags alloc_flags,
 
   // Allocate pseudo fine grain memory
   kmt_alloc_flags.ui32.CoarseGrain = (alloc_flags & AllocatePCIeRW ? 0 : kmt_alloc_flags.ui32.CoarseGrain);
+  kmt_alloc_flags.ui32.Uncached  = (alloc_flags & AllocatePCIeRW ? 1 : kmt_alloc_flags.ui32.Uncached);
 
   // Only allow using the suballocator for ordinary VRAM.
   if (IsLocalMemory()) {