diff --git a/bin/test-32-bit b/bin/test-32-bit
index ba91ce5..e0379c2 100755
--- a/bin/test-32-bit
+++ b/bin/test-32-bit
@@ -3,4 +3,4 @@
 cd "$(dirname "${BASH_SOURCE[0]}")"
 cd ..
 exec ./containers/32-bit/run bash -c \
-     'cd skyfield && ls && assay --batch skyfield/tests'
+     'cd skyfield && assay --batch '"${*:-skyfield/tests}"
diff --git a/bin/test-python-2.6 b/bin/test-python-2.6
index c3da582..f913341 100755
--- a/bin/test-python-2.6
+++ b/bin/test-python-2.6
@@ -3,4 +3,4 @@
 cd "$(dirname "${BASH_SOURCE[0]}")"
 cd ..
 exec ./containers/python-2.6/run bash -c \
-     'cd skyfield && ls && assay --batch skyfield/tests'
+     'cd skyfield && assay --batch '"${*:-skyfield/tests}"