diff --git a/cinder/brick/local_dev/lvm.py b/cinder/brick/local_dev/lvm.py
index 9444558399f..8bb92244a9c 100644
--- a/cinder/brick/local_dev/lvm.py
+++ b/cinder/brick/local_dev/lvm.py
@@ -459,7 +459,7 @@ 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/cinder/tests/unit/brick/test_brick_lvm.py b/cinder/tests/unit/brick/test_brick_lvm.py
index ec1a79493f0..3a9f1d0f7ae 100644
--- a/cinder/tests/unit/brick/test_brick_lvm.py
+++ b/cinder/tests/unit/brick/test_brick_lvm.py
@@ -322,7 +322,7 @@ class BrickLvmTestCase(test.TestCase):
         self.assertEqual(
             "9.5g",
             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)
 
@@ -331,7 +331,7 @@ class BrickLvmTestCase(test.TestCase):
         self.assertEqual(
             "9.5g",
             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)