diff --git a/dlls/wined3d/wined3d.spec b/dlls/wined3d/wined3d.spec
index d70a0c499fa..7df80fb54f9 100644
--- a/dlls/wined3d/wined3d.spec
+++ b/dlls/wined3d/wined3d.spec
@@ -243,7 +243,7 @@
 
 @ cdecl wined3d_swapchain_create(ptr ptr ptr ptr ptr)
 @ cdecl wined3d_swapchain_decref(ptr)
-@ cdecl wined3d_swapchain_get_back_buffer(ptr long long)
+@ cdecl wined3d_swapchain_get_back_buffer(ptr long)
 @ cdecl wined3d_swapchain_get_device(ptr)
 @ cdecl wined3d_swapchain_get_display_mode(ptr ptr ptr)
 @ cdecl wined3d_swapchain_get_front_buffer_data(ptr ptr long)