diff --git a/prestart.sh b/prestart.sh
index 1f0f672..e070375 100644
--- a/prestart.sh
+++ b/prestart.sh
@@ -57,7 +57,7 @@ async def set_passwords():
                 try:
                     # ALTER ROLE doesn't support prepared statement parameters
                     # so we inline the password (extracted from DB URL, safe)
-                    await conn.execute(text(f"ALTER ROLE {role} WITH LOGIN PASSWORD '{pwd}'"))
+                    await conn.execute(text("ALTER ROLE " + role + " WITH LOGIN PASSWORD '" + pwd + "'"))
                     print(f'[prestart] Password set for {role}')
                 except Exception as e:
                     print(f'[prestart] WARNING: Could not set password for {role}: {e}')