diff --git a/dlls/gdi/dib.c b/dlls/gdi/dib.c
index 410295ead74..83952f0838e 100644
--- a/dlls/gdi/dib.c
+++ b/dlls/gdi/dib.c
@@ -308,7 +308,7 @@ INT WINAPI SetDIBitsToDevice(HDC hdc, INT xDest, INT yDest, DWORD cx,
 /***********************************************************************
  *           SetDIBColorTable    (GDI32.@)
  */
-UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries, RGBQUAD *colors )
+UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries, CONST RGBQUAD *colors )
 {
     DC * dc;
     UINT result = 0;
diff --git a/include/wingdi.h b/include/wingdi.h
index d3d64bdf517..fac3c63a3ba 100644
--- a/include/wingdi.h
+++ b/include/wingdi.h
@@ -3517,7 +3517,7 @@ HCOLORSPACE WINAPI SetColorSpace(HDC,HCOLORSPACE);
 BOOL      WINAPI SetDeviceGammaRamp(HDC,LPVOID);
 COLORREF  WINAPI SetDCBrushColor(HDC,COLORREF);
 COLORREF  WINAPI SetDCPenColor(HDC, COLORREF);
-UINT      WINAPI SetDIBColorTable(HDC,UINT,UINT,RGBQUAD*);
+UINT      WINAPI SetDIBColorTable(HDC,UINT,UINT,CONST RGBQUAD*);
 INT       WINAPI SetDIBits(HDC,HBITMAP,UINT,UINT,LPCVOID,const BITMAPINFO*,UINT);
 INT       WINAPI SetDIBitsToDevice(HDC,INT,INT,DWORD,DWORD,INT,
                          INT,UINT,UINT,LPCVOID,const BITMAPINFO*,UINT);