diff --git a/dlib/dnn/trainer.h b/dlib/dnn/trainer.h
index 38ef0cc3a..907c52f89 100644
--- a/dlib/dnn/trainer.h
+++ b/dlib/dnn/trainer.h
@@ -343,7 +343,7 @@ namespace dlib
         void init()
         {
             num_epochs = 300;
-            mini_batch_size = 11;
+            mini_batch_size = 32;
             verbose = false;
             cuda_device_id = dlib::cuda::get_device();
             start();