diff --git a/ci/run-test-slice.sh b/ci/run-test-slice.sh
index 0444c79c02..ff948e397f 100755
--- a/ci/run-test-slice.sh
+++ b/ci/run-test-slice.sh
@@ -5,9 +5,9 @@
 
 . ${0%/*}/lib.sh
 
-group "Run tests" make --quiet -C t T="$(cd t &&
-	./helper/test-tool path-utils slice-tests "$1" "$2" t[0-9]*.sh |
-	tr '\n' ' ')" ||
+TESTS=$(cd t && ./helper/test-tool path-utils slice-tests "$1" "$2" t[0-9]*.sh)
+
+group "Run tests" make --quiet -C t T="$(echo "$TESTS" | tr '\n' ' ')" ||
 handle_failed_tests
 
 # We only have one unit test at the moment, so run it in the first slice