diff --git a/calcurse.spec b/calcurse.spec
index 16ec47b..e055789 100644
--- a/calcurse.spec
+++ b/calcurse.spec
@@ -44,6 +44,7 @@ documented within an online help system.
 
 %prep
 %setup -q
+sed -i "s/#!\/usr\/bin\/env python3/#!\/usr\/bin\/python3/" contrib/caldav/calcurse-caldav.py
 
 %build
 %configure