diff --git a/tcl.changes b/tcl.changes
index a99b1cc..7c11448 100644
--- a/tcl.changes
+++ b/tcl.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sun Nov 25 06:04:02 UTC 2012 - aj@suse.de
+
+- The testsuite needs timezone data, require it at build time.
+
 -------------------------------------------------------------------
 Thu Aug  9 11:14:51 UTC 2012 - max@suse.com
 
diff --git a/tcl.spec b/tcl.spec
index d76cf8e..33e5962 100644
--- a/tcl.spec
+++ b/tcl.spec
@@ -41,6 +41,8 @@ Source3:        macros.tcl
 Patch0:         tcl.patch
 Patch1:         tcl-unload.patch
 BuildRequires:  autoconf
+# Required for test suite:
+BuildRequires:  timezone
 
 %description
 Tcl (Tool Command Language) is a very powerful but easy to learn