diff --git a/internal/ceres/minimizer.h b/internal/ceres/minimizer.h
index e15b165..70b530f 100644
--- a/internal/ceres/minimizer.h
+++ b/internal/ceres/minimizer.h
@@ -78,6 +78,7 @@
       evaluator = NULL;
       trust_region_strategy = NULL;
       jacobian = NULL;
+      callbacks = options.callbacks;
     }
 
     int max_num_iterations;