Index: trunk/src/obj_arc.c
===================================================================
--- trunk/src/obj_arc.c	(revision 775)
+++ trunk/src/obj_arc.c	(revision 776)
@@ -67,6 +67,7 @@
 	a.c.start = (180-obj->arc.start) / RND_RAD_TO_DEG;
 	a.c.delta = -obj->arc.delta / RND_RAD_TO_DEG;
 	a.s.width = obj->arc.thick;
+	a.s.cap = G2D_CAP_ROUND;
 	box = g2d_sarc_bbox(&a);
 
 	obj->arc.bbox.x1 = box.p1.x; obj->arc.bbox.y1 = box.p1.y;