diff --git a/sdk/include/psdk/gdiplusflat.h b/sdk/include/psdk/gdiplusflat.h
index af8033e3b31..57fa6c64f22 100644
--- a/sdk/include/psdk/gdiplusflat.h
+++ b/sdk/include/psdk/gdiplusflat.h
@@ -630,7 +630,9 @@ GpStatus WINGDIPAPI GdipGetPenDashOffset(GpPen*,REAL*);
 GpStatus WINGDIPAPI GdipGetPenDashStyle(GpPen*,GpDashStyle*);
 GpStatus WINGDIPAPI GdipGetPenMode(GpPen*,GpPenAlignment*);
 GpStatus WINGDIPAPI GdipGetPenTransform(GpPen *, GpMatrix *);
+GpStatus WINGDIPAPI GdipMultiplyPenTransform(GpPen *,GDIPCONST GpMatrix *,GpMatrixOrder);
 GpStatus WINGDIPAPI GdipResetPenTransform(GpPen*);
+GpStatus WINGDIPAPI GdipRotatePenTransform(GpPen*,REAL,GpMatrixOrder);
 GpStatus WINGDIPAPI GdipScalePenTransform(GpPen*,REAL,REAL,GpMatrixOrder);
 GpStatus WINGDIPAPI GdipSetPenBrushFill(GpPen*,GpBrush*);
 GpStatus WINGDIPAPI GdipSetPenColor(GpPen*,ARGB);