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-rw-r--r--debian/zshrc2
1 files changed, 1 insertions, 1 deletions
diff --git a/debian/zshrc b/debian/zshrc
index 84d644d8f..45aebde31 100644
--- a/debian/zshrc
+++ b/debian/zshrc
@@ -11,7 +11,7 @@ READNULLCMD=${PAGER:-/usr/bin/pager}
# An array to note missing features to ease diagnosis in case of problems.
typeset -ga debian_missing_features
-if [[ -z "$DEBIAN_PREVENT_KEYBOARD_CHANGES" ]] &&
+if [[ -z "${DEBIAN_PREVENT_KEYBOARD_CHANGES-}" ]] &&
[[ "$TERM" != 'emacs' ]]
then