diff --git a/borgmatic/config/schema.yaml b/borgmatic/config/schema.yaml
index 9c12f6c9f..85fcb9d0e 100644
--- a/borgmatic/config/schema.yaml
+++ b/borgmatic/config/schema.yaml
@@ -2683,7 +2683,7 @@ properties:
                 description: |
                     Command to use instead of "keepassxc-cli".
                 example: /usr/local/bin/keepassxc-cli
-            key-file:
+            key_file:
                 type: string
                 description: |
                     Path to a key file for unlocking the KeePassXC database.