diff --git a/.builds/debian.yml b/.builds/debian.yml
index 3f3713e..851e2a0 100644
--- a/.builds/debian.yml
+++ b/.builds/debian.yml
@@ -13,11 +13,14 @@ tasks:
       cd Stegano
       poetry install
   - lint: |
+      export PATH="$PATH:/home/build/.local/bin"
       # stop the build if there are Python syntax errors or undefined names
       poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-      # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+      # exit-zero treats all errors as warnings.
       poetry run flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
   - test: |
+      export PATH="$PATH:/home/build/.local/bin"
       poetry run nosetests
   - typecheck: |
+      export PATH="$PATH:/home/build/.local/bin"
       poetry run python tools/run_mypy.py