diff --git a/.travis.yml b/.travis.yml
index 095d1fb621..dad07e74f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -226,14 +226,14 @@ after_success:
         - set -o errexit; source ./ci/extended_lint/06_script.sh
 
     - stage: test
-      name: 'ARM  [GOAL: install]  [unit tests, functional tests]'
+      name: 'ARM  [GOAL: install]  [bionic]  [unit tests, functional tests]'
       arch: arm64
       env: >-
         FILE_ENV="./ci/test/00_setup_env_arm.sh"
         QEMU_USER_CMD=""  # Can run the tests natively without qemu
 
     - stage: test
-      name: 'S390x  [GOAL: install]  [unit tests, functional tests]'
+      name: 'S390x  [GOAL: install]  [bionic]  [unit tests, functional tests]'
       arch: s390x
       env: >-
         FILE_ENV="./ci/test/00_setup_env_s390x.sh"
diff --git a/ci/dash/matrix.sh b/ci/dash/matrix.sh
index 6b21a0f5d8..7b99fda6c0 100755
--- a/ci/dash/matrix.sh
+++ b/ci/dash/matrix.sh
@@ -36,4 +36,6 @@ elif [ "$BUILD_TARGET" = "linux64_nowallet" ]; then
   source ./ci/test/00_setup_env_native_nowallet.sh
 elif [ "$BUILD_TARGET" = "mac" ]; then
   source ./ci/test/00_setup_env_mac.sh
+elif [ "$BUILD_TARGET" = "s390x" ]; then
+  source ./ci/test/00_setup_env_s390x.sh
 fi
diff --git a/ci/test/00_setup_env_s390x.sh b/ci/test/00_setup_env_s390x.sh
index e5169ff8a9..89660c7fa4 100644
--- a/ci/test/00_setup_env_s390x.sh
+++ b/ci/test/00_setup_env_s390x.sh
@@ -7,12 +7,9 @@
 export LC_ALL=C.UTF-8
 
 export HOST=s390x-unknown-linux-gnu
-export DOCKER_NAME_TAG=s390x/ubuntu:18.04
 export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=true
-export RUN_FUNCTIONAL_TESTS=false
+export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-reduce-exports --with-incompatible-bdb"
-
-lscpu
diff --git a/ci/test/04_install.sh b/ci/test/04_install.sh
index 1ba6802559..b8f26260cf 100755
--- a/ci/test/04_install.sh
+++ b/ci/test/04_install.sh
@@ -80,6 +80,8 @@ if [ "$TRAVIS_OS_NAME" == "osx" ]; then
 else
   DOCKER_EXEC free -m -h
   DOCKER_EXEC echo "Number of CPUs \(nproc\):" \$\(nproc\)
+  DOCKER_EXEC echo "Free disk space:"
+  DOCKER_EXEC df -h
 fi
 
 if [ -n "$DPKG_ADD_ARCH" ]; then
diff --git a/test/functional/interface_rest.py b/test/functional/interface_rest.py
index 7513ac6472..f0a2b0e87c 100755
--- a/test/functional/interface_rest.py
+++ b/test/functional/interface_rest.py
@@ -162,7 +162,7 @@ class RESTTest (BitcoinTestFramework):
 
         bin_response = self.test_rest_request("/getutxos", http_method='POST', req_type=ReqType.BIN, body=bin_request, ret_type=RetType.BYTES)
         output = BytesIO(bin_response)
-        chain_height, = unpack("i", output.read(4))
+        chain_height, = unpack("<i", output.read(4))
         response_hash = output.read(32)[::-1].hex()
 
         assert_equal(bb_hash, response_hash)  # check if getutxo's chaintip during calculation was fine