diff --git a/seminar/models.py b/seminar/models.py
index ed0ad8e5..6969b91d 100644
--- a/seminar/models.py
+++ b/seminar/models.py
@@ -609,7 +609,7 @@ class Cislo(SeminarModelBase):
 				"-dBATCH",
 				"-dNOPROMPT",
 				"-sDEVICE=png16m",
-				"-r150x150",
+				"-r300x300",
 				"-dFirstPage=1d",
 				"-dLastPage=1d",
 				"-sOutputFile=" + str(png_filename),