diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index 5c8f0b6f..19f715aa 100644
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -2832,7 +2832,7 @@ reload_core_config (OstreeRepo          *self,
                                                 &lock_timeout_seconds, error))
           return FALSE;
 
-        self->lock_timeout_seconds = g_ascii_strtoull (lock_timeout_seconds, NULL, 10);
+        self->lock_timeout_seconds = g_ascii_strtoll (lock_timeout_seconds, NULL, 10);
       }
   }