diff --git a/libhsakmt.h b/libhsakmt.h
index 0f852ead65..031ceb33cf 100644
--- a/libhsakmt.h
+++ b/libhsakmt.h
@@ -36,6 +36,7 @@
 #include "impl/wddm/device.h"
 
 wsl::thunk::WDDMDevice* get_wddmdev(uint32_t node_id);
+uint32_t get_num_wddmdev();
 wsl::thunk::GpuMemory *get_gpu_mem(void *MemoryAddress);
 
 #define HSAKMT_DEBUG_LEVEL_ERR      -1
diff --git a/topology.cpp b/topology.cpp
index e9e34be8d6..397477e534 100644
--- a/topology.cpp
+++ b/topology.cpp
@@ -1461,3 +1461,7 @@ wsl::thunk::WDDMDevice *get_wddmdev(uint32_t node_id) {
 
   return dxg_topology->wdevices_[node_id - 1];
 }
+
+uint32_t get_num_wddmdev() {
+  return dxg_topology->wdevices_.size();
+}