diff --git a/src/migrations/0021_migrate_to_bullseye.py b/src/migrations/0021_migrate_to_bullseye.py
index f17855913..6b1d7c30b 100644
--- a/src/migrations/0021_migrate_to_bullseye.py
+++ b/src/migrations/0021_migrate_to_bullseye.py
@@ -525,7 +525,7 @@ class MyMigration(Migration):
         )
 
         cmd = (
-            f"LC_ALL=C DEBIAN_FRONTEND=noninteractive APT_LISTCHANGES_FRONTEND=none apt install --quiet -o=Dpkg::Use-Pty=0 --fix-broken --assume-yes "
+            "LC_ALL=C DEBIAN_FRONTEND=noninteractive APT_LISTCHANGES_FRONTEND=none apt install --quiet -o=Dpkg::Use-Pty=0 --fix-broken --assume-yes "
             + cmd
         )