diff --git a/blivet/formats/fs.py b/blivet/formats/fs.py
index 13068331e..618799231 100644
--- a/blivet/formats/fs.py
+++ b/blivet/formats/fs.py
@@ -1562,31 +1562,6 @@ def destroy(self, *args, **kwargs):
         """
         pass
 
-    def _getExistingSize(self, info=None):
-        """ Get current size of tmpfs filesystem using df.
-
-            :param NoneType info: a dummy parameter
-            :rtype: Size
-            :returns: the current size of the filesystem, 0 if not found.
-        """
-        if not self.status:
-            return Size(0)
-
-        df = ["df", self._mountpoint, "--output=size"]
-        try:
-            (ret, out) = util.run_program_and_capture_output(df)
-        except OSError:
-            return Size(0)
-
-        if ret:
-            return Size(0)
-
-        lines = out.split()
-        if len(lines) != 2 or lines[0] != "1K-blocks":
-            return Size(0)
-
-        return Size("%s KiB" % lines[1])
-
     @property
     def mountable(self):
         return True
diff --git a/tests/formats_test/fs_test.py b/tests/formats_test/fs_test.py
index 5c32a8122..691ac8a21 100755
--- a/tests/formats_test/fs_test.py
+++ b/tests/formats_test/fs_test.py
@@ -1,10 +1,7 @@
 #!/usr/bin/python
-import os
-import tempfile
 import unittest2 as unittest
 
 import blivet.formats.fs as fs
-from blivet.size import Size, ROUND_DOWN
 
 from tests import loopbackedtestcase
 
@@ -119,40 +116,5 @@ def testSimple(self):
         self.assertEqual(an_fs.device, "tmpfs")
         self.assertTrue(an_fs.testMount())
 
-class ResizeTmpFSTestCase(loopbackedtestcase.LoopBackedTestCase):
-
-    def __init__(self, methodName='runTest'):
-        super(ResizeTmpFSTestCase, self).__init__(methodName=methodName)
-        self.an_fs = fs.TmpFS()
-        self.an_fs.__class__._resizable = True
-        self.mountpoint = None
-
-    def setUp(self):
-        self.mountpoint = tempfile.mkdtemp()
-        self.an_fs.mountpoint = self.mountpoint
-        self.an_fs.mount()
-
-    def testResize(self):
-        self.an_fs.updateSizeInfo()
-        newsize = self.an_fs.currentSize * 2
-        self.an_fs.targetSize = newsize
-        self.assertIsNone(self.an_fs.doResize())
-        self.assertEqual(self.an_fs.size, newsize.roundToNearest(self.an_fs._resizefsUnit, rounding=ROUND_DOWN))
-
-    def testShrink(self):
-        # Can not shrink tmpfs, because its minimum size is its current size
-        self.an_fs.updateSizeInfo()
-        newsize = Size("2 MiB")
-        self.assertTrue(newsize < self.an_fs.currentSize)
-        with self.assertRaises(ValueError):
-            self.an_fs.targetSize = newsize
-
-    def teardown(self):
-        try:
-            self.an_fs.unmount()
-        except Exception: # pylint: disable=broad-except
-            pass
-        os.rmdir(self.mountpoint)
-
 if __name__ == "__main__":
     unittest.main()