diff --git a/imgui.cpp b/imgui.cpp
index 1cada18fc..26518852a 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -14931,14 +14931,14 @@ bool ImGui::SetDragDropPayload(const char* type, const void* data, size_t data_s
             // Store in heap
             g.DragDropPayloadBufHeap.resize((int)data_size);
             payload.Data = g.DragDropPayloadBufHeap.Data;
-            memcpy(payload.Data, data, data_size);
+            memcpy(payload.Data, data, (size_t)(int)data_size);
         }
         else if (data_size > 0)
         {
             // Store locally
             memset(&g.DragDropPayloadBufLocal, 0, sizeof(g.DragDropPayloadBufLocal));
             payload.Data = g.DragDropPayloadBufLocal;
-            memcpy(payload.Data, data, data_size);
+            memcpy(payload.Data, data, (size_t)(int)data_size);
         }
         else
         {