diff --git a/include/gdiplusflat.h b/include/gdiplusflat.h
index 98246461ef..d4f51a34eb 100644
--- a/include/gdiplusflat.h
+++ b/include/gdiplusflat.h
@@ -74,12 +74,15 @@ GpStatus WINGDIPAPI GdipCreateCustomLineCap(GpPath*,GpPath*,GpLineCap,REAL,
     GpCustomLineCap**);
 GpStatus WINGDIPAPI GdipDeleteCustomLineCap(GpCustomLineCap*);
 GpStatus WINGDIPAPI GdipGetCustomLineCapBaseCap(GpCustomLineCap*,GpLineCap*);
+GpStatus WINGDIPAPI GdipSetCustomLineCapBaseCap(GpCustomLineCap*,GpLineCap);
 GpStatus WINGDIPAPI GdipGetCustomLineCapBaseInset(GpCustomLineCap*,REAL*);
+GpStatus WINGDIPAPI GdipSetCustomLineCapBaseInset(GpCustomLineCap*,REAL);
 GpStatus WINGDIPAPI GdipSetCustomLineCapStrokeCaps(GpCustomLineCap*,GpLineCap,
     GpLineCap);
 GpStatus WINGDIPAPI GdipGetCustomLineCapStrokeJoin(GpCustomLineCap*,GpLineJoin*);
 GpStatus WINGDIPAPI GdipSetCustomLineCapStrokeJoin(GpCustomLineCap*,GpLineJoin);
 GpStatus WINGDIPAPI GdipGetCustomLineCapWidthScale(GpCustomLineCap*,REAL*);
+GpStatus WINGDIPAPI GdipSetCustomLineCapBaseInset(GpCustomLineCap*,REAL);
 
 /* Font */
 GpStatus WINGDIPAPI GdipCloneFont(GpFont*,GpFont**);