diff --git a/hacking/titotest-centos-6.4/Dockerfile b/hacking/titotest-centos-6.4/Dockerfile
index 7048be4..74be4c2 100644
--- a/hacking/titotest-centos-6.4/Dockerfile
+++ b/hacking/titotest-centos-6.4/Dockerfile
@@ -1,5 +1,5 @@
 # https://index.docker.io/_/centos/
-FROM tianon/centos:6.4
+FROM centos:6.4
 
 # http://jumanjiman.github.io/
 MAINTAINER Paul Morgan <jumanjiman@gmail.com>
diff --git a/src/tito/builder/main.py b/src/tito/builder/main.py
index 8859c69..875d777 100644
--- a/src/tito/builder/main.py
+++ b/src/tito/builder/main.py
@@ -1018,5 +1018,19 @@ class GitAnnexBuilder(NoTgzBuilder):
         os.chdir(old_cwd)
 
     def cleanup(self):
-        run_command("git-annex lock --force")
+        if _lock_force_supported(_get_annex_version()):
+            run_command("git-annex lock --force")
+        else:
+            run_command("git-annex lock")
         super(GitAnnexBuilder, self).cleanup()
+
+    def _get_annex_version(self):
+        # git-annex needs to support --force when locking files.
+        ga_version = run_command('git-annex version').split('\n')
+        if ga_version[0].startswith('git-annex version'):
+            ga_version[0].split()[-1]
+        else:
+            return 0
+
+    def _lock_force_supported(self, version):
+        return compare_version(version, '5.20131213') >= 0
diff --git a/src/tito/common.py b/src/tito/common.py
index 9c7dbd6..2862e36 100644
--- a/src/tito/common.py
+++ b/src/tito/common.py
@@ -677,3 +677,13 @@ def find_wrote_in_rpmbuild_output(output):
     if not paths:
         error_out("Unable to locate 'Wrote: ' lines in rpmbuild output: '%s'" % output)
     return paths
+
+
+def compare_version(version1, version2):
+    """
+    Compare two version strings, returning negative if version1 is < version2,
+    zero when equal and positive when version1 > version2.
+    """
+    def normalize(v):
+        return [int(x) for x in re.sub(r'(\.0+)*$', '', v).split(".")]
+    return cmp(normalize(version1), normalize(version2))
diff --git a/test/functional/build_gitannex_tests.py b/test/functional/build_gitannex_tests.py
index 1da04ad..fd8bb06 100644
--- a/test/functional/build_gitannex_tests.py
+++ b/test/functional/build_gitannex_tests.py
@@ -43,13 +43,9 @@ class GitAnnexBuilderTests(TitoGitTestFixture):
         if sys.version[0:3] == '2.4':
             raise SkipTest('git-annex is not available in epel-5')
 
-        # git-annex needs to support --force when locking files.
-        # rpm query is sub-optimal, but older versions do not support `git-annex version'.
-        status, ga_version = getstatusoutput('rpm -q --qf=%{version} git-annex')
+        status, ga_version = getstatusoutput('rpm -q git-annex')
         if status != 0:
             raise SkipTest("git-annex is missing")
-        if ga_version < GIT_ANNEX_MINIMUM_VERSION:
-            raise SkipTest("git-annex '%s' is too old" % ga_version)
 
         # Setup test config:
         self.config = RawConfigParser()
@@ -91,3 +87,13 @@ class GitAnnexBuilderTests(TitoGitTestFixture):
             "extsrc-0.0.2-1.*src.rpm"))))
         self.assertEquals(1, len(glob.glob(join(self.output_dir, 'noarch',
             "extsrc-0.0.2-1.*.noarch.rpm"))))
+
+    def test_lock_force_supported(self):
+        tito('tag --debug --accept-auto-changelog')
+        builder = GitAnnexBuilder(PKG_NAME, None, self.output_dir,
+            self.config, {}, {}, **{'offline': True})
+
+        self.assertTrue(builder._lock_force_supported('5.20140107'))
+        self.assertTrue(builder._lock_force_supported('5.20131213'))
+        self.assertFalse(builder._lock_force_supported('5.20131127.1'))
+        self.assertFalse(builder._lock_force_supported('3.20120522'))
diff --git a/test/unit/common-tests.py b/test/unit/common-tests.py
index 5281ead..29dae5c 100644
--- a/test/unit/common-tests.py
+++ b/test/unit/common-tests.py
@@ -219,3 +219,21 @@ class ExtractBugzillasTest(unittest.TestCase):
         find_wrote_in_rpmbuild_output(output)
 
         common.error_out.assert_called_once_with("Unable to locate 'Wrote: ' lines in rpmbuild output: '%s'" % output)
+
+    def test_compare_version(self):
+        self.assertEquals(0, compare_version("1", "1"))
+        self.assertTrue(compare_version("2.1", "2.2") < 0)
+        self.assertTrue(compare_version("3.0.4.10", "3.0.4.2") > 0)
+        self.assertTrue(compare_version("4.08", "4.08.01") < 0)
+        self.assertTrue(compare_version("3.2.1.9.8144", "3.2") > 0)
+        self.assertTrue(compare_version("3.2", "3.2.1.9.8144") < 0)
+        self.assertTrue(compare_version("1.2", "2.1") < 0)
+        self.assertTrue(compare_version("2.1", "1.2") > 0)
+        self.assertTrue(compare_version("1.0", "1.0.1") < 0)
+        self.assertTrue(compare_version("1.0.1", "1.0") > 0)
+        self.assertEquals(0, compare_version("5.6.7", "5.6.7"))
+        self.assertEquals(0, compare_version("1.01.1", "1.1.1"))
+        self.assertEquals(0, compare_version("1.1.1", "1.01.1"))
+        self.assertEquals(0, compare_version("1", "1.0"))
+        self.assertEquals(0, compare_version("1.0", "1"))
+        self.assertEquals(0, compare_version("1.0.2.0", "1.0.2"))