diff --git a/completion/available/travis.completion.bash b/completion/available/travis.completion.bash
index 28d599aa..49d8f2cc 100644
--- a/completion/available/travis.completion.bash
+++ b/completion/available/travis.completion.bash
@@ -1,5 +1,10 @@
-if [[ -x "$(which travis)" ]]; then
-  __TRAVIS_COMPLETION_SCRIPT="${TRAVIS_CONFIG_PATH:-${HOME}/.travis}/travis.sh"
-  [[ -f "${__TRAVIS_COMPLETION_SCRIPT}" ]] && source "${__TRAVIS_COMPLETION_SCRIPT}"
+# shellcheck shell=bash
+
+if _command_exists travis
+then
+  if [[ -s "${__TRAVIS_COMPLETION_SCRIPT:=${TRAVIS_CONFIG_PATH:-${HOME}/.travis}/travis.sh}" ]]
+	then
+		source "${__TRAVIS_COMPLETION_SCRIPT}"
+	fi
   unset __TRAVIS_COMPLETION_SCRIPT
 fi