diff --git a/include/gdiplusflat.h b/include/gdiplusflat.h
index 25b6f5f..76c129c 100644
--- a/include/gdiplusflat.h
+++ b/include/gdiplusflat.h
@@ -41,6 +41,7 @@
 GpStatus WINGDIPAPI GdipSetPenCustomEndCap(GpPen*,GpCustomLineCap*);
 GpStatus WINGDIPAPI GdipSetPenCustomStartCap(GpPen*,GpCustomLineCap*);
 GpStatus WINGDIPAPI GdipSetPenDashArray(GpPen*,GDIPCONST REAL*,INT);
+GpStatus WINGDIPAPI GdipSetPenDashCap197819(GpPen*,GpDashCap);
 GpStatus WINGDIPAPI GdipSetPenDashOffset(GpPen*,REAL);
 GpStatus WINGDIPAPI GdipSetPenDashStyle(GpPen*,GpDashStyle);
 GpStatus WINGDIPAPI GdipSetPenEndCap(GpPen*,GpLineCap);