diff --git a/README.md b/README.md
index e5c3c31..7b673db 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Requirements:
 pip install -r /requirements.txt
 
 export RESTIC_REPO_URL=/data
-export PASSWORD_FILE=/restic_password_file
+export RESTIC_REPO_PASSWORD_FILE=/restic_password_file
 python restic-exporter.py
 ```
 
diff --git a/entrypoint.sh b/entrypoint.sh
index a9832f6..9e17911 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -3,17 +3,14 @@
 # Exit on error. For debug use set -x
 set -e
 
-export PASSWORD_FILE="/tmp/restic_passwd"
-
 if [ -z "${RESTIC_REPO_PASSWORD}" ]; then
   if [ -z "${RESTIC_REPO_PASSWORD_FILE}" ]; then
     echo "You have to define one of these environment variables: RESTIC_REPO_PASSWORD or RESTIC_REPO_PASSWORD_FILE"
     exit 1
-  else
-    cp "${RESTIC_REPO_PASSWORD_FILE}" "${PASSWORD_FILE}"
   fi
 else
-  echo "${RESTIC_REPO_PASSWORD}" > "${PASSWORD_FILE}"
+  export RESTIC_REPO_PASSWORD_FILE="/tmp/restic_passwd"
+  echo "${RESTIC_REPO_PASSWORD}" > "${RESTIC_REPO_PASSWORD_FILE}"
 fi
 
 /usr/local/bin/python -u /restic-exporter.py
diff --git a/restic-exporter.py b/restic-exporter.py
index 46ee0e4..7636c87 100644
--- a/restic-exporter.py
+++ b/restic-exporter.py
@@ -14,9 +14,9 @@ import prometheus_client.core
 
 
 class ResticCollector(object):
-    def __init__(self, repository, password_file_):
+    def __init__(self, repository, password_file):
         self.repository = repository
-        self.password_file = password_file_
+        self.password_file = password_file
         # todo: the stats cache increases over time -> remove old ids
         # todo: cold start -> the stats cache could be saved in a persistent volume
         # todo: cold start -> the restic cache (/root/.cache/restic) could be saved in a persistent volume
@@ -212,16 +212,16 @@ if __name__ == "__main__":
         sys.exit(1)
 
     try:
-        password_file = os.environ["PASSWORD_FILE"]
+        restic_repo_password_file = os.environ["RESTIC_REPO_PASSWORD_FILE"]
     except Exception:
-        logging.error("Configuration error. The environment variable PASSWORD_FILE is mandatory")
+        logging.error("Configuration error. The environment variable RESTIC_REPO_PASSWORD_FILE is mandatory")
         sys.exit(1)
 
     exporter_address = os.environ.get("LISTEN_ADDRESS", "0.0.0.0")
     exporter_port = int(os.environ.get("LISTEN_PORT", 8001))
     exporter_refresh_interval = int(os.environ.get("REFRESH_INTERVAL", 60))
 
-    collector = ResticCollector(restic_repo_url, password_file)
+    collector = ResticCollector(restic_repo_url, restic_repo_password_file)
 
     prometheus_client.core.REGISTRY.register(collector)
     prometheus_client.start_http_server(exporter_port, exporter_address)