diff --git a/scripts/env.sh b/scripts/env.sh
index e1188f0..d2d61fc 100755
--- a/scripts/env.sh
+++ b/scripts/env.sh
@@ -1,3 +1,5 @@
+#! /usr/bin/env sh
+
 response=`curl -X 'GET' "https://$VAULT_HOST/v1/$VAULT_SECRET_PATH" -s \
   -H 'accept: application/json' \
   -H "X-Vault-Token: $VAULT_TOKEN"`
diff --git a/scripts/start.sh b/scripts/start.sh
index f3ff1a5..41b1931 100644
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -1,3 +1,5 @@
+#! /usr/bin/env sh
+
 export $(/env.sh)
 
 exec /usr/local/bin/fb2converter_server