diff --git a/clean_files.txt b/clean_files.txt
index 850af6e6..703c219f 100644
--- a/clean_files.txt
+++ b/clean_files.txt
@@ -69,6 +69,7 @@ completion/available/github-cli.completion.bash
 completion/available/helm.completion.bash
 completion/available/jungle.completion.bash
 completion/available/knife.completion.bash
+completion/available/kontena.completion.bash
 completion/available/packer.completion.bash
 completion/available/pip.completion.bash
 completion/available/pip3.completion.bash
diff --git a/completion/available/kontena.completion.bash b/completion/available/kontena.completion.bash
index a1d24b3c..916ee15f 100644
--- a/completion/available/kontena.completion.bash
+++ b/completion/available/kontena.completion.bash
@@ -1 +1,5 @@
-which kontena > /dev/null && . "$( kontena whoami --bash-completion-path )"
+# shellcheck shell=bash
+if _command_exists kontena; then
+	# shellcheck disable=SC1090
+	source "$(kontena whoami --bash-completion-path)"
+fi