diff --git a/flake.nix b/flake.nix
index 5bc3f5e..a9e48eb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -591,14 +591,12 @@
                           if $PSQL --command "SELECT 1 FROM pg_roles WHERE rolname='${cfg.replication.username}';" | grep -q 1
                           then
                             echo "alter replication user ${cfg.replication.username}"
-                            $PSQL \
-                              --variable=v1="''$(<''${CREDENTIALS_DIRECTORY}/postgresql-replication-password)" \
-                              --command "ALTER ROLE ${cfg.replication.username} WITH REPLICATION LOGIN PASSWORD :'v1';"
+                            echo "ALTER ROLE ${cfg.replication.username} WITH REPLICATION LOGIN PASSWORD :'v1';" | $PSQL \
+                              --variable=v1="''$(<''${CREDENTIALS_DIRECTORY}/postgresql-replication-password)"
                           else
                             echo "create replication user ${cfg.replication.username}"
-                            $PSQL \
-                              --variable=v1="''$(<''${CREDENTIALS_DIRECTORY}/postgresql-replication-password)" \
-                              --command "CREATE ROLE ${cfg.replication.username} WITH REPLICATION LOGIN PASSWORD :'v1';"
+                            echo "CREATE ROLE ${cfg.replication.username} WITH REPLICATION LOGIN PASSWORD :'v1';" | $PSQL \
+                              --variable=v1="''$(<''${CREDENTIALS_DIRECTORY}/postgresql-replication-password)"
                           fi
                         ''
                       else "";