diff --git a/reactos/subsystems/win32/win32k/objects/dibobj.c b/reactos/subsystems/win32/win32k/objects/dibobj.c
index 4fbdd612c74..a5b1607d5d2 100644
--- a/reactos/subsystems/win32/win32k/objects/dibobj.c
+++ b/reactos/subsystems/win32/win32k/objects/dibobj.c
@@ -1354,11 +1354,18 @@ BuildDIBPalette (CONST BITMAPINFO *bmi, PINT paletteType)
       *paletteType = PAL_INDEXED;
       RedMask = GreenMask = BlueMask = 0;
     }
+  else if(bmi->bmiHeader.biCompression == BI_BITFIELDS)
+    {
+      *paletteType = PAL_BITFIELDS;
+      RedMask = ((ULONG *)bmi->bmiColors)[0];
+      GreenMask = ((ULONG *)bmi->bmiColors)[1];
+      BlueMask = ((ULONG *)bmi->bmiColors)[2];
+    }
   else if(bits < 24)
     {
       *paletteType = PAL_BITFIELDS;
-      RedMask = 0xf800;
-      GreenMask = 0x07e0;
+      RedMask = 0x7c00;
+      GreenMask = 0x03e0;
       BlueMask = 0x001f;
     }
   else