diff --git a/.travis.yml b/.travis.yml
index f6f3c1eff5f..73e62cd2b04 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,6 +28,7 @@
 dist: xenial
 os: linux
 language: minimal
+arch: amd64
 cache:
   ccache: true
   directories:
@@ -114,33 +115,33 @@ jobs:
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [bionic]  [uses qt5 dev package instead of depends Qt to speed up build and avoid timeout] [unsigned char]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_amd64_qt5.sh"
+        FILE_ENV="./ci/test/00_setup_env_native_qt5.sh"
 
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [trusty]  [no functional tests, no depends, only system libs]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_amd64_trusty.sh"
+        FILE_ENV="./ci/test/00_setup_env_native_trusty.sh"
 
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [xenial]  [no depends, only system libs, sanitizers: thread (TSan), no wallet]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_amd64_tsan.sh"
+        FILE_ENV="./ci/test/00_setup_env_native_tsan.sh"
         TEST_RUNNER_EXTRA="--exclude feature_block"  # Not enough memory on travis machines
 
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no depends, only system libs, sanitizers: address/leak (ASan + LSan) + undefined (UBSan) + integer]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_amd64_asan.sh"
+        FILE_ENV="./ci/test/00_setup_env_native_asan.sh"
 
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no depends, only system libs, sanitizers: fuzzer,address,undefined]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_amd64_fuzz.sh"
+        FILE_ENV="./ci/test/00_setup_env_native_fuzz.sh"
 
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no wallet]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_amd64_nowallet.sh"
+        FILE_ENV="./ci/test/00_setup_env_native_nowallet.sh"
 
     - stage: test
       name: 'macOS 10.10  [GOAL: deploy] [no functional tests]'
diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 8bc50da2c3d..07b191739aa 100755
--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@@ -21,6 +21,9 @@ echo "Fallback to default values in env (if not yet set)"
 export MAKEJOBS=${MAKEJOBS:--j4}
 # A folder for the ci system to put temporary files (ccache, datadirs for tests, ...)
 export BASE_SCRATCH_DIR=${BASE_SCRATCH_DIR:-$BASE_ROOT_DIR/ci/scratch/}
+# What host to compile for. See also ./depends/README.md
+# Tests that need cross-compilation export the appropriate HOST.
+# Tests that run natively, do not set a HOST, but we assume x86_64 here if the calling environment did not set a HOST
 export HOST=${HOST:-x86_64-unknown-linux-gnu}
 # Whether to prefer BusyBox over GNU utilities
 export USE_BUSY_BOX=${USE_BUSY_BOX:-false}
diff --git a/ci/test/00_setup_env_amd64_asan.sh b/ci/test/00_setup_env_native_asan.sh
similarity index 95%
rename from ci/test/00_setup_env_amd64_asan.sh
rename to ci/test/00_setup_env_native_asan.sh
index 46b870e145f..293f37fedf5 100644
--- a/ci/test/00_setup_env_amd64_asan.sh
+++ b/ci/test/00_setup_env_native_asan.sh
@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=x86_64-unknown-linux-gnu
 export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libssl1.0-dev 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 GOAL="install"
diff --git a/ci/test/00_setup_env_amd64_fuzz.sh b/ci/test/00_setup_env_native_fuzz.sh
similarity index 94%
rename from ci/test/00_setup_env_amd64_fuzz.sh
rename to ci/test/00_setup_env_native_fuzz.sh
index 7bdfc2c3200..2e9f529216f 100644
--- a/ci/test/00_setup_env_amd64_fuzz.sh
+++ b/ci/test/00_setup_env_native_fuzz.sh
@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=x86_64-unknown-linux-gnu
 export PACKAGES="clang llvm python3 libssl1.0-dev libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false
diff --git a/ci/test/00_setup_env_amd64_nowallet.sh b/ci/test/00_setup_env_native_nowallet.sh
similarity index 91%
rename from ci/test/00_setup_env_amd64_nowallet.sh
rename to ci/test/00_setup_env_native_nowallet.sh
index d5a2ba31119..53348559bea 100644
--- a/ci/test/00_setup_env_amd64_nowallet.sh
+++ b/ci/test/00_setup_env_native_nowallet.sh
@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=x86_64-unknown-linux-gnu
 export PACKAGES="python3-zmq"
 export DEP_OPTS="NO_WALLET=1"
 export GOAL="install"
diff --git a/ci/test/00_setup_env_amd64_qt5.sh b/ci/test/00_setup_env_native_qt5.sh
similarity index 95%
rename from ci/test/00_setup_env_amd64_qt5.sh
rename to ci/test/00_setup_env_native_qt5.sh
index 55820ea8357..622ec3cfe17 100644
--- a/ci/test/00_setup_env_amd64_qt5.sh
+++ b/ci/test/00_setup_env_native_qt5.sh
@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=x86_64-unknown-linux-gnu
 export PACKAGES="python3-zmq qtbase5-dev qttools5-dev-tools libdbus-1-dev libharfbuzz-dev"
 export DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1 ALLOW_HOST_PACKAGES=1"
 export TEST_RUNNER_EXTRA="--coverage --extended --exclude feature_dbcrash"  # Run extended tests so that coverage does not fail, but exclude the very slow dbcrash
diff --git a/ci/test/00_setup_env_amd64_trusty.sh b/ci/test/00_setup_env_native_trusty.sh
similarity index 94%
rename from ci/test/00_setup_env_amd64_trusty.sh
rename to ci/test/00_setup_env_native_trusty.sh
index 51e98788c78..fbf1488f07b 100644
--- a/ci/test/00_setup_env_amd64_trusty.sh
+++ b/ci/test/00_setup_env_native_trusty.sh
@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=x86_64-unknown-linux-gnu
 export DOCKER_NAME_TAG=ubuntu:14.04
 export PACKAGES="python3-zmq qtbase5-dev qttools5-dev-tools libicu-dev libpng-dev libssl-dev libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.1++-dev libzmq3-dev libqrencode-dev"
 export NO_DEPENDS=1
diff --git a/ci/test/00_setup_env_amd64_tsan.sh b/ci/test/00_setup_env_native_tsan.sh
similarity index 95%
rename from ci/test/00_setup_env_amd64_tsan.sh
rename to ci/test/00_setup_env_native_tsan.sh
index 82ac988c413..afc082d6cfa 100644
--- a/ci/test/00_setup_env_amd64_tsan.sh
+++ b/ci/test/00_setup_env_native_tsan.sh
@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=x86_64-unknown-linux-gnu
 export DOCKER_NAME_TAG=ubuntu:16.04
 export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libssl-dev 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