diff --git a/scripts/lib/logging.sh b/scripts/lib/logging.sh
index 9d28aa284..8e7d5b09a 100755
--- a/scripts/lib/logging.sh
+++ b/scripts/lib/logging.sh
@@ -20,7 +20,7 @@ OPENIM_VERBOSE="${OPENIM_VERBOSE:-5}"
 ENABLE_LOGGING="${ENABLE_LOGGING:-true}"
 
 # If OPENIM_OUTPUT is not set, set it to the default value
-if [[ ! -v OPENIM_OUTPUT ]]; then
+if [ -z "${OPENIM_OUTPUT+x}" ]; then
     OPENIM_OUTPUT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../_output" && pwd -P)"
 fi