diff --git a/lib/ansible/modules/system/filesystem.py b/lib/ansible/modules/system/filesystem.py
index 0eb9f60919..16df042f3a 100644
--- a/lib/ansible/modules/system/filesystem.py
+++ b/lib/ansible/modules/system/filesystem.py
@@ -307,8 +307,8 @@ class LVM(Filesystem):
 
     def get_fs_size(self, dev):
         cmd = self.module.get_bin_path('pvs', required=True)
-        _, size, _ = self.module.run_command([cmd, '--noheadings', '-o', 'pv_size', '--units', 'b', str(dev)], check_rc=True)
-        block_count = int(size[:-1])  # block size is 1
+        _, size, _ = self.module.run_command([cmd, '--noheadings', '-o', 'pv_size', '--units', 'b', '--nosuffix', str(dev)], check_rc=True)
+        block_count = int(size)
         return block_count