diff --git a/include/ddraw.h b/include/ddraw.h
index 28d53aefac..5f08c89619 100644
--- a/include/ddraw.h
+++ b/include/ddraw.h
@@ -2694,8 +2694,8 @@ DECLARE_INTERFACE_(IDirectDrawGammaControl,IUnknown)
     STDMETHOD_(ULONG,AddRef)(THIS) PURE;
     STDMETHOD_(ULONG,Release)(THIS) PURE;
     /*** IDirectDrawGammaControl methods ***/
-    STDMETHOD(GetGammaRamp)(THIS_ DWORD dwFlags, LPDDGAMMARAMP lpGammaRamp) PURE;
-    STDMETHOD(SetGammaRamp)(THIS_ DWORD dwFlags, LPDDGAMMARAMP lpGammaRamp) PURE;
+    STDMETHOD(GetGammaRamp)(THIS_ DWORD flags, DDGAMMARAMP *gamma_ramp) PURE;
+    STDMETHOD(SetGammaRamp)(THIS_ DWORD flags, DDGAMMARAMP *gamma_ramp) PURE;
 };
 #undef INTERFACE
 
diff --git a/include/ddrawi.h b/include/ddrawi.h
index e7f40991bd..016e3eaea2 100644
--- a/include/ddrawi.h
+++ b/include/ddrawi.h
@@ -432,7 +432,7 @@ typedef struct _DDHAL_DDMISCELLANEOUS2CALLBACKS {
     LPDDHAL_DESTROYDDLOCAL		DestroyDDLocal;
 } DDHAL_DDMISCELLANEOUS2CALLBACKS,*LPDDHAL_DDMISCELLANEOUS2CALLBACKS;
 
-typedef HRESULT (WINAPI *LPDDGAMMACALIBRATORPROC)(LPDDGAMMARAMP, LPBYTE);
+typedef HRESULT (WINAPI *LPDDGAMMACALIBRATORPROC)(DDGAMMARAMP *, BYTE *);
 
 /*****************************************************************************
  * driver info structure