diff --git a/dlls/d3d8/d3d8.spec b/dlls/d3d8/d3d8.spec
index 07f25cb0069..bc82cd099da 100644
--- a/dlls/d3d8/d3d8.spec
+++ b/dlls/d3d8/d3d8.spec
@@ -1,5 +1,5 @@
 @ stdcall D3D8GetSWInfo()
 @ stdcall DebugSetMute()
 @ stdcall Direct3DCreate8(long)
-@ stdcall ValidatePixelShader(ptr ptr)
-@ stdcall ValidateVertexShader(ptr)
+@ stdcall ValidatePixelShader(ptr long long ptr)
+@ stdcall ValidateVertexShader(ptr long long ptr)
diff --git a/dlls/d3d8/shader.c b/dlls/d3d8/shader.c
index a57e8123bd0..0692fd94f5c 100644
--- a/dlls/d3d8/shader.c
+++ b/dlls/d3d8/shader.c
@@ -2365,15 +2365,17 @@ HRESULT WINAPI IDirect3DPixelShaderImpl_GetConstantF(IDirect3DPixelShaderImpl* T
 /***********************************************************************
  *		ValidateVertexShader (D3D8.@)
  */
-BOOL WINAPI ValidateVertexShader(LPVOID what) {
-  FIXME("(void): stub: %p\n", what);
-  return 0;
+BOOL WINAPI ValidateVertexShader(LPVOID pFunction, int param1, int param2, LPVOID toto/* result? */) {
+
+      FIXME("(void): stub: pFunction %p, param1 %d, param2 %d, result? %p\n",  pFunction, param1, param2, toto);
+        return 0;
 }
 
 /***********************************************************************
- *		ValidatePixelShader (D3D8.@)
- */
-BOOL WINAPI ValidatePixelShader(LPVOID what, LPVOID toto) {
-  FIXME("(void): stub: %p %p\n", what, toto);
-  return TRUE;
+ *  *              ValidatePixelShader (D3D8.@)
+ *   */
+BOOL WINAPI ValidatePixelShader(LPVOID pFunction, int param1, int param2, LPVOID toto/* result? */) {
+
+      FIXME("(void): stub: pFunction %p, param1 %d, param2 %d, result? %p\n",  pFunction, param1, param2, toto);
+        return TRUE;
 }