diff --git a/ironic/common/disk_partitioner.py b/ironic/common/disk_partitioner.py
index d2e1d8e6e4..34ab495474 100644
--- a/ironic/common/disk_partitioner.py
+++ b/ironic/common/disk_partitioner.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import os
 import re
 
 from oslo.config import cfg
@@ -186,8 +187,10 @@ def list_partitions(device):
     :returns: list of dictionaries (one per partition) with keys:
               start, end, size (in MiB), filesystem, flags
     """
-    output = utils.execute(
-        'parted', '-s', '-m', device, 'unit', 'MiB', 'print')[0]
+    env = os.environ.copy()
+    env['LC_ALL'] = 'C'
+    output = utils.execute('parted', '-s', '-m', device, 'unit', 'MiB',
+                           'print', env_variables=env)[0]
     lines = [line for line in output.split('\n') if line.strip()][2:]
     # Example of line: 1:1.00MiB:501MiB:500MiB:ext4::boot
     fields = ('start', 'end', 'size', 'filesystem', 'flags')
diff --git a/ironic/tests/test_disk_partitioner.py b/ironic/tests/test_disk_partitioner.py
index 8cbf273420..494510f031 100644
--- a/ironic/tests/test_disk_partitioner.py
+++ b/ironic/tests/test_disk_partitioner.py
@@ -15,6 +15,7 @@
 
 import fixtures
 import mock
+import os
 from testtools.matchers import HasLength
 
 from ironic.common import disk_partitioner
@@ -166,7 +167,8 @@ class DiskPartitionerTestCase(base.TestCase):
 @mock.patch.object(utils, 'execute')
 class ListPartitionsTestCase(base.TestCase):
 
-    def test_correct(self, execute_mock):
+    @mock.patch.object(os.environ, 'copy', return_value={})
+    def test_correct(self, env_mock, execute_mock):
         output = """
 BYT;
 /dev/sda:500107862016B:scsi:512:4096:msdos:ATA HGST HTS725050A7:;
@@ -180,10 +182,12 @@ BYT;
              'filesystem': '', 'flags': ''},
         ]
         execute_mock.return_value = (output, '')
+        env = {'LC_ALL': 'C'}
         result = disk_partitioner.list_partitions('/dev/fake')
         self.assertEqual(expected, result)
         execute_mock.assert_called_once_with(
-            'parted', '-s', '-m', '/dev/fake', 'unit', 'MiB', 'print')
+            'parted', '-s', '-m', '/dev/fake', 'unit', 'MiB', 'print',
+            env_variables=env)
 
     @mock.patch.object(disk_partitioner.LOG, 'warn')
     def test_incorrect(self, log_mock, execute_mock):