diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 68b904c..418eceb 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -89,19 +89,11 @@ fi
 
 DEPLOYMENT_COMMAND="docker --log-level=debug compose"
 
-STACK_FILE=true
-if [ -z "${INPUT_STACK_FILE_NAME+x}" ]; then
-  STACK_FILE=false
-fi
-if $STACK_FILE ; then
+if ! [ "x${INPUT_STACK_FILE_NAME}"=="x" ]; then
   DEPLOYMENT_COMMAND="$DEPLOYMENT_COMMAND -f ${INPUT_STACK_FILE_NAME//,/ -f }"
 fi
 
-ENV_FILE=true
-if [ -z "${INPUT_ENV_FILE_NAME+x}" ]; then
-  ENV_FILE=false
-fi
-if $ENV_FILE ; then
+if ! [ "x${INPUT_ENV_FILE_NAME}"=="x" ]; then
   DEPLOYMENT_COMMAND="$DEPLOYMENT_COMMAND --env-file ${INPUT_ENV_FILE_NAME//,/ --env-file }"
 fi