diff --git a/ruby.spec b/ruby.spec
index a396dba..57bc909 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -651,7 +651,7 @@ DISABLE_TESTS=""
 # Once seen: http://koji.fedoraproject.org/koji/taskinfo?taskID=12556650
 DISABLE_TESTS="$DISABLE_TESTS -x test_fork.rb"
 
-make check TESTS="-v $DISABLE_TESTS"
+TZ=UTC make check TESTS="-v $DISABLE_TESTS"
 
 %post libs -p /sbin/ldconfig
 
@@ -957,6 +957,7 @@ make check TESTS="-v $DISABLE_TESTS"
 * Wed Apr 13 2016 Pavel Valena <pvalena@redhat.com>
 - Fix ruby lib path in macros.ruby.rh-ruby23
   - Resolves: rhbz#1255753
+- Manually set UTC timezone for tests
 
 * Mon Feb 22 2016 Vít Ondruch <vondruch@redhat.com> - 2.3.0-59
 - Don't prefix bundling provides.