diff --git a/.circleci/config.yml b/.circleci/config.yml
index 24a6fe62..28766c50 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,11 +4,13 @@ version: 2
   machine: true
   steps:
     - checkout
-    - run:
+    - run: &checkouttask
         name: Pull submodules
         command: |
           git submodule init
           git submodule update
+          git checkout $CIRCLECI_BRANCH
+          git reset --hard $CIRCLECI_SHA1
     - run:
         name: Install the emulation handlers
         command: docker run --rm --privileged multiarch/qemu-user-static:register --reset
@@ -27,10 +29,7 @@ version: 2
   steps:
     - checkout
     - run:
-        name: Pull submodules
-        command: |
-          git submodule init
-          git submodule update
+        <<: *checkouttask
     - run:
         name: Run tests
         command: |
diff --git a/.travis.yml b/.travis.yml
index 30ea3fda..2d0c501e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@ matrix:
       before_script:
         - git config --replace-all remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
         - git fetch --unshallow
+        - git checkout $TRAVIS_BRANCH
+        - git reset --hard $TRAVIS_COMMIT
       script:
         - "cd test && python3 -m nose --rednose --verbose"
       env:
@@ -31,6 +33,8 @@ matrix:
       before_install:
         - git config --replace-all remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
         - git fetch --unshallow
+        - git checkout $TRAVIS_BRANCH
+        - git reset --hard $TRAVIS_COMMIT
         - pip3 install -r requirements.txt
         - brew link gcc
         - export PATH="/usr/local/bin:$PATH"
diff --git a/appveyor.yml b/appveyor.yml
index cba69d42..41dfba47 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -23,7 +23,9 @@ init:
 
 build_script:
   - git config --replace-all remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
-  - git fetch
+  - git fetch --unshallow
+  - git checkout %APPVEYOR_REPO_BRANCH%
+  - git reset --hard %APPVEYOR_REPO_COMMIT%
   - python -m pip install -r requirements.txt
   - cd test
     # Download Astyle to local folder because putting it in PATH doesn't work