diff --git a/tests/letstest/scripts/test_sdists.sh b/tests/letstest/scripts/test_sdists.sh
index 56c03c2fc..a1736a64c 100755
--- a/tests/letstest/scripts/test_sdists.sh
+++ b/tests/letstest/scripts/test_sdists.sh
@@ -40,7 +40,9 @@ for pkg in acme certbot $PLUGINS; do
     tar -xvf "$pkg-$VERSION.tar.gz"
     cd "$pkg-$VERSION"
     python setup.py build
-    pytest
-    python setup.py install
+    cd build/lib
+    python -m pytest ../../tests
     cd -
+    python setup.py install
+    cd $TEMP_DIR
 done