diff --git a/mono-core.changes b/mono-core.changes
index 496db9d..a9140b6 100644
--- a/mono-core.changes
+++ b/mono-core.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Mon Mar 16 11:13:24 UTC 2015 - dimstar@opensuse.org
+
+- Add timezone requires: Ensure that DateTime functionality is
+  given when installing mono-core (e.g. System.DateTime.get_Now()
+  needs access to this information).
+
 -------------------------------------------------------------------
 Tue Mar 10 17:10:58 UTC 2015 - mailaender@opensuse.org
 
diff --git a/mono-core.spec b/mono-core.spec
index e7d19cd..59c9395 100644
--- a/mono-core.spec
+++ b/mono-core.spec
@@ -90,6 +90,8 @@ Provides:       mono(System) = 1.0.5000.0
 Provides:       mono(System.Security) = 1.0.5000.0
 Provides:       mono(System.Xml) = 1.0.5000.0
 Provides:       mono(mscorlib) = 1.0.5000.0
+# mono-core provides System.DateTime functions, which rely on timezone information
+Requires:       timezone
 
 %define _use_internal_dependency_generator 0
 %define __find_provides env sh -c 'filelist=($(cat)) && { printf "%s\\n" "${filelist[@]}" | /usr/lib/rpm/find-provides && printf "%s\\n" "${filelist[@]}" | prefix=%{buildroot}%{_prefix} %{buildroot}%{_bindir}/mono-find-provides ; } | sort | uniq'