diff --git a/.travis.yml b/.travis.yml
index 6b72ac2c..2761cd1b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,8 @@ matrix:
       compiler: clang
       before_install:
         - pip3 install -r requirements.txt
+      before_script:
+        - git fetch --unshallow
       script:
         - "cd test && python3 -m nose --rednose --verbose"
       env:
@@ -26,6 +28,7 @@ matrix:
       env:
         PQCLEAN_ONLY_DIFF: 1
       before_install:
+        - git fetch --unshallow
         - pip3 install -r requirements.txt
         - brew link gcc
         - export PATH="/usr/local/bin:$PATH"
diff --git a/appveyor.yml b/appveyor.yml
index e9b9464e..eccf644b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,6 +5,8 @@ image: Visual Studio 2017
 build:
   verbosity: minimal
 
+shallow_clone: false
+
 environment:
   PQCLEAN_ONLY_DIFF: 1
   matrix:
diff --git a/test/helpers.py b/test/helpers.py
index 2fcd3f03..b97457a5 100644
--- a/test/helpers.py
+++ b/test/helpers.py
@@ -161,7 +161,7 @@ def permit_test(testname, thing, **args):
                         return True
             # where are there changes?
             diff_result = subprocess.run(
-                ['git', 'diff', '--name-only', 'master'],
+                ['git', 'diff', '--name-only', 'origin/master'],
                 stdout=subprocess.PIPE,
                 stderr=subprocess.STDOUT
             )