diff --git a/0004-Ensure-correct-type-of-mpath-cache-member-list.patch b/0004-Ensure-correct-type-of-mpath-cache-member-list.patch
new file mode 100644
index 0000000..53e3da0
--- /dev/null
+++ b/0004-Ensure-correct-type-of-mpath-cache-member-list.patch
@@ -0,0 +1,28 @@
+From d01281a69e317d7bae4a7698edb6583b6310d5c1 Mon Sep 17 00:00:00 2001
+From: David Lehman <dlehman@redhat.com>
+Date: Tue, 19 Mar 2019 11:51:47 -0400
+Subject: [PATCH] Ensure correct type of mpath cache member list.
+
+Related: rhbz#1672971
+---
+ blivet/static_data/mpath_info.py | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/blivet/static_data/mpath_info.py b/blivet/static_data/mpath_info.py
+index 49ba4709..64958ba8 100644
+--- a/blivet/static_data/mpath_info.py
++++ b/blivet/static_data/mpath_info.py
+@@ -42,8 +42,11 @@ def is_mpath_member(self, device):
+         :param str device: path of the device to query
+
+         """
+-        if self._members is None and availability.BLOCKDEV_MPATH_PLUGIN.available:
+-            self._members = set(blockdev.mpath.get_mpath_members())
++        if self._members is None:
++            if availability.BLOCKDEV_MPATH_PLUGIN.available:
++                self._members = set(blockdev.mpath.get_mpath_members())
++            else:
++                self._members = set()
+
+         device = os.path.realpath(device)
+         device = device[len("/dev/"):]
diff --git a/python-blivet.spec b/python-blivet.spec
index b94491b..fe763de 100644
--- a/python-blivet.spec
+++ b/python-blivet.spec
@@ -23,7 +23,7 @@ Version: 3.1.2
 
 #%%global prerelease .b2
 # prerelease, if defined, should be something like .a1, .b1, .b2.dev1, or .c2
-Release: 3%{?prerelease}%{?dist}
+Release: 4%{?prerelease}%{?dist}
 Epoch: 1
 License: LGPLv2+
 Group: System Environment/Libraries
@@ -33,6 +33,7 @@ Source0: http://github.com/storaged-project/blivet/archive/%{realname}-%{realver
 Patch0: 0001-force-lvm-plugin.patch
 Patch1: 0002-Dont-crash-if-blockdev-mpath-plugin-isnt-available.patch
 Patch2: 0003-Support-legacy-MBR-as-part-of-UEFI.patch
+Patch3: 0004-Ensure-correct-type-of-mpath-cache-member-list.patch
 
 # Versions of required components (done so we make sure the buildrequires
 # match the requires versions of things).
@@ -193,6 +194,9 @@ configuration.
 %endif
 
 %changelog
+* Thu Mar 21 2019 Vojtech Trefny <vtrefny@redhat.com> - 3.1.2-4
+- Ensure correct type of mpath cache member list
+
 * Mon Mar 11 2019 Vojtech Trefny <vtrefny@redhat.com> - 3.1.2-3
 - Support legacy MBR (msdos) as part of UEFI to enable hybrid builds