diff --git a/projects/clr/rocclr/device/devhostcall.cpp b/projects/clr/rocclr/device/devhostcall.cpp
index 7f74cc8eb9..8577abc01e 100644
--- a/projects/clr/rocclr/device/devhostcall.cpp
+++ b/projects/clr/rocclr/device/devhostcall.cpp
@@ -101,7 +101,7 @@ class HostcallBuffer {
   /** Stack of free packets. Uses tagged pointers. */
   uint64_t free_stack_;
   /** Stack of ready packets. Uses tagged pointers */
-  std::atomic<int64_t> ready_stack_;
+  std::atomic<uint64_t> ready_stack_;
   /** Mask for accessing the packet index in the tagged pointer. */
   uint64_t index_mask_;
 
@@ -176,7 +176,7 @@ void HostcallBuffer::processPackets(MessageHandler& messages) {
   // Grab the entire ready stack and set the top to 0. New requests from the
   // device will continue pushing on the stack while we process the packets that
   // we have grabbed.
-  uint64_t ready_stack = std::atomic_exchange_explicit(&ready_stack_, static_cast<int64_t>(0), std::memory_order_acquire);
+  uint64_t ready_stack = std::atomic_exchange_explicit(&ready_stack_, static_cast<uint64_t>(0), std::memory_order_acquire);
   if (!ready_stack) {
     return;
   }