diff --git a/python-icalendar.spec b/python-icalendar.spec
index 610c4a4..991d32e 100644
--- a/python-icalendar.spec
+++ b/python-icalendar.spec
@@ -12,8 +12,10 @@ BuildArch:      noarch
 BuildRequires:  python2-devel
 BuildRequires:  python-setuptools
 BuildRequires:  pytz
+BuildRequires:  python-dateutil
 
 Requires:       pytz
+Requires:       python-dateutil
 
 %description
 iCalendar specification (RFC 2445) defines calendaring format used