diff --git a/ci/depends.sh b/ci/depends.sh
index 3686ec9a..847e1473 100755
--- a/ci/depends.sh
+++ b/ci/depends.sh
@@ -29,7 +29,7 @@ end_group
 start_group "install source depends"
 sudo apt-get update
 # shellcheck disable=SC2086
-sudo apt-get build-dep $INPUT_APT_OPTS -- "./$source_dir"
+sudo apt-get build-dep $INPUT_APT_OPTS -- "$source_dir"
 
 # In theory, explicitly installing dpkg-dev would not be necessary. `apt-get
 # build-dep` will *always* install build-essential which depends on dpkg-dev.