X-Git-Url: https://git.bzium.org/embe/embe-profile-files.git/blobdiff_plain/8b010a84585c4971d420cbed7b794346c6de1244..bb2fb60b80c32e3273979158c46e119f0158c501:/prefix.sh

diff --git a/prefix.sh b/prefix.sh
index 092a0a8..e5972b2 100644
--- a/prefix.sh
+++ b/prefix.sh
@@ -1,3 +1,3 @@
-[[ -z "$BASH_VERSION" ]] || shopt -q login_shell || return
-[[ -z "$ZSH_VERSION" ]] || [[ -o login ]] || return
+[[ -z "${BASH_VERSION+set}" ]] || shopt -q login_shell || return
+[[ -z "${ZSH_VERSION+set}" ]] || [[ -o login ]] || return
 [[ "$-" == *i* ]] || return