diff --git a/sys/src/cmd/postscript/common/bbox.c b/sys/src/cmd/postscript/common/bbox.c
index 7e1f14a50..ded0e850a 100644
--- a/sys/src/cmd/postscript/common/bbox.c
+++ b/sys/src/cmd/postscript/common/bbox.c
@@ -209,7 +209,7 @@ rotate(angle)
  *
  */
 
-    angle *= 3.1416 / 180;
+    angle *= PI / 180;
 
     matrix1[0] = matrix1[3] = cos(angle);
     matrix1[1] = sin(angle);