diff --git a/dlls/d3d10core/state.c b/dlls/d3d10core/state.c
index 8d2dae1f5be..b5d8cf81164 100644
--- a/dlls/d3d10core/state.c
+++ b/dlls/d3d10core/state.c
@@ -121,9 +121,11 @@ static HRESULT STDMETHODCALLTYPE d3d10_blend_state_SetPrivateData(ID3D10BlendSta
 static HRESULT STDMETHODCALLTYPE d3d10_blend_state_SetPrivateDataInterface(ID3D10BlendState *iface,
         REFGUID guid, const IUnknown *data)
 {
-    FIXME("iface %p, guid %s, data %p stub!\n", iface, debugstr_guid(guid), data);
+    struct d3d10_blend_state *state = impl_from_ID3D10BlendState(iface);
 
-    return E_NOTIMPL;
+    TRACE("iface %p, guid %s, data %p.\n", iface, debugstr_guid(guid), data);
+
+    return d3d10_set_private_data_interface(&state->private_store, guid, data);
 }
 
 /* ID3D10BlendState methods */