diff --git a/Dockerfile b/Dockerfile
index f06e4fa..16915d7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,6 +23,7 @@ ENV PASSPHRASE ''
 ENV BACKUP_KEEP_DAYS ''
 
 ADD src/run.sh run.sh
+ADD src/env.sh env.sh
 ADD src/backup.sh backup.sh
 ADD src/restore.sh restore.sh
 
diff --git a/src/backup.sh b/src/backup.sh
index 70040c6..0dd786c 100644
--- a/src/backup.sh
+++ b/src/backup.sh
@@ -3,51 +3,7 @@
 set -eu
 set -o pipefail
 
-if [ -z "$S3_BUCKET" ]; then
-  echo "You need to set the S3_BUCKET environment variable."
-  exit 1
-fi
-
-if [ -z "$POSTGRES_DATABASE" ]; then
-  echo "You need to set the POSTGRES_DATABASE environment variable."
-  exit 1
-fi
-
-if [ -z "$POSTGRES_HOST" ]; then
-  if [ -n "$POSTGRES_PORT_5432_TCP_ADDR" ]; then
-    POSTGRES_HOST=$POSTGRES_PORT_5432_TCP_ADDR
-    POSTGRES_PORT=$POSTGRES_PORT_5432_TCP_PORT
-  else
-    echo "You need to set the POSTGRES_HOST environment variable."
-    exit 1
-  fi
-fi
-
-if [ -z "$POSTGRES_USER" ]; then
-  echo "You need to set the POSTGRES_USER environment variable."
-  exit 1
-fi
-
-if [ -z "$POSTGRES_PASSWORD" ]; then
-  echo "You need to set the POSTGRES_PASSWORD environment variable."
-  exit 1
-fi
-
-if [ -z "$S3_ENDPOINT" ]; then
-  aws_args=""
-else
-  aws_args="--endpoint-url $S3_ENDPOINT"
-fi
-
-
-if [ -n "$S3_ACCESS_KEY_ID" ]; then
-  export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
-fi
-if [ -n "$S3_SECRET_ACCESS_KEY" ]; then
-  export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
-fi
-export AWS_DEFAULT_REGION=$S3_REGION
-export PGPASSWORD=$POSTGRES_PASSWORD
+source ./env.sh
 
 echo "Creating backup of $POSTGRES_DATABASE database..."
 pg_dump --format=custom \
diff --git a/src/env.sh b/src/env.sh
new file mode 100644
index 0000000..af495e4
--- /dev/null
+++ b/src/env.sh
@@ -0,0 +1,46 @@
+if [ -z "$S3_BUCKET" ]; then
+  echo "You need to set the S3_BUCKET environment variable."
+  exit 1
+fi
+
+if [ -z "$POSTGRES_DATABASE" ]; then
+  echo "You need to set the POSTGRES_DATABASE environment variable."
+  exit 1
+fi
+
+if [ -z "$POSTGRES_HOST" ]; then
+  # https://docs.docker.com/network/links/#environment-variables
+  if [ -n "$POSTGRES_PORT_5432_TCP_ADDR" ]; then
+    POSTGRES_HOST=$POSTGRES_PORT_5432_TCP_ADDR
+    POSTGRES_PORT=$POSTGRES_PORT_5432_TCP_PORT
+  else
+    echo "You need to set the POSTGRES_HOST environment variable."
+    exit 1
+  fi
+fi
+
+if [ -z "$POSTGRES_USER" ]; then
+  echo "You need to set the POSTGRES_USER environment variable."
+  exit 1
+fi
+
+if [ -z "$POSTGRES_PASSWORD" ]; then
+  echo "You need to set the POSTGRES_PASSWORD environment variable."
+  exit 1
+fi
+
+if [ -z "$S3_ENDPOINT" ]; then
+  aws_args=""
+else
+  aws_args="--endpoint-url $S3_ENDPOINT"
+fi
+
+
+if [ -n "$S3_ACCESS_KEY_ID" ]; then
+  export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
+fi
+if [ -n "$S3_SECRET_ACCESS_KEY" ]; then
+  export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
+fi
+export AWS_DEFAULT_REGION=$S3_REGION
+export PGPASSWORD=$POSTGRES_PASSWORD
diff --git a/src/restore.sh b/src/restore.sh
index 6340645..3040146 100644
--- a/src/restore.sh
+++ b/src/restore.sh
@@ -3,52 +3,7 @@
 set -u # `-e` omitted intentionally, but i can't remember why exactly :'(
 set -o pipefail
 
-if [ -z "$S3_BUCKET" ]; then
-  echo "You need to set the S3_BUCKET environment variable."
-  exit 1
-fi
-
-if [ -z "$POSTGRES_DATABASE" ]; then
-  echo "You need to set the POSTGRES_DATABASE environment variable."
-  exit 1
-fi
-
-if [ -z "$POSTGRES_HOST" ]; then
-  # https://docs.docker.com/network/links/#environment-variables
-  if [ -n "$POSTGRES_PORT_5432_TCP_ADDR" ]; then
-    POSTGRES_HOST=$POSTGRES_PORT_5432_TCP_ADDR
-    POSTGRES_PORT=$POSTGRES_PORT_5432_TCP_PORT
-  else
-    echo "You need to set the POSTGRES_HOST environment variable."
-    exit 1
-  fi
-fi
-
-if [ -z "$POSTGRES_USER" ]; then
-  echo "You need to set the POSTGRES_USER environment variable."
-  exit 1
-fi
-
-if [ -z "$POSTGRES_PASSWORD" ]; then
-  echo "You need to set the POSTGRES_PASSWORD environment variable."
-  exit 1
-fi
-
-if [ -z "$S3_ENDPOINT" ]; then
-  aws_args=""
-else
-  aws_args="--endpoint-url $S3_ENDPOINT"
-fi
-
-
-if [ -n "$S3_ACCESS_KEY_ID" ]; then
-  export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
-fi
-if [ -n "$S3_SECRET_ACCESS_KEY" ]; then
-  export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
-fi
-export AWS_DEFAULT_REGION=$S3_REGION
-export PGPASSWORD=$POSTGRES_PASSWORD
+source ./env.sh
 
 s3_uri_base="s3://${S3_BUCKET}/${S3_PREFIX}"