diff --git a/os_brick/local_dev/lvm.py b/os_brick/local_dev/lvm.py
index 3e8f32b19..f0aaca153 100644
--- a/os_brick/local_dev/lvm.py
+++ b/os_brick/local_dev/lvm.py
@@ -463,7 +463,7 @@ class LVM(executor.Executor):
                 if not lv['size'][-1].isdigit():
                     lvsize = lvsize[:-1]
                 if lv['name'] == self.vg_thin_pool:
-                    self.vg_thin_pool_size = lvsize
+                    self.vg_thin_pool_size = float(lvsize)
                     tpfs = self._get_thin_pool_free_space(self.vg_name,
                                                           self.vg_thin_pool)
                     self.vg_thin_pool_free_space = tpfs
diff --git a/os_brick/tests/local_dev/test_brick_lvm.py b/os_brick/tests/local_dev/test_brick_lvm.py
index 25aa14ba4..70fbf52af 100644
--- a/os_brick/tests/local_dev/test_brick_lvm.py
+++ b/os_brick/tests/local_dev/test_brick_lvm.py
@@ -292,14 +292,14 @@ class BrickLvmTestCase(base.TestCase):
         self.vg.vg_thin_pool = "test-prov-cap-pool-unit"
         self.vg.vg_name = 'test-prov-cap-vg-unit'
         self.assertIsNone(self.vg.create_thin_pool(name=self.vg.vg_thin_pool))
-        self.assertEqual("9.50", self.vg.vg_thin_pool_size)
+        self.assertEqual(9.50, self.vg.vg_thin_pool_size)
         self.assertEqual(7.6, self.vg.vg_thin_pool_free_space)
         self.assertEqual(3.0, self.vg.vg_provisioned_capacity)
 
         self.vg.vg_thin_pool = "test-prov-cap-pool-no-unit"
         self.vg.vg_name = 'test-prov-cap-vg-no-unit'
         self.assertIsNone(self.vg.create_thin_pool(name=self.vg.vg_thin_pool))
-        self.assertEqual("9.50", self.vg.vg_thin_pool_size)
+        self.assertEqual(9.50, self.vg.vg_thin_pool_size)
         self.assertEqual(7.6, self.vg.vg_thin_pool_free_space)
         self.assertEqual(3.0, self.vg.vg_provisioned_capacity)