diff --git a/compose.instance.yaml b/compose.instance.yaml
index 997a667..34a1f5e 100644
--- a/compose.instance.yaml
+++ b/compose.instance.yaml
@@ -31,6 +31,10 @@
       # hack, which rewrites /kalamar/kalamar.production.conf in place and would
       # fight the read-only mount below.
       KALAMAR_EXPORT: "false"
+      # Let slow API requests (statistics over large virtual corpora) finish:
+      # the daemon otherwise drops the client after 30 s although its API
+      # user agent waits up to 120 s for Kustvakt.
+      MOJO_INACTIVITY_TIMEOUT: "130"
     volumes:
       - ${KALAMAR_INSTANCE_DIR}/kalamar.ids-mannheim.conf:/kalamar/kalamar.production.conf:ro
       - ${KALAMAR_INSTANCE_DIR}/templates/custom:/kalamar/templates/custom:ro