diff --git a/dlib/dnn/cpu_dlib.h b/dlib/dnn/cpu_dlib.h
index a838540fe..3d7a9cd82 100644
--- a/dlib/dnn/cpu_dlib.h
+++ b/dlib/dnn/cpu_dlib.h
@@ -385,13 +385,15 @@ namespace dlib
         };
 
     // -----------------------------------------------------------------------------------
-    void copy_tensor(
+
+        void copy_tensor(
             tensor& dest,
             size_t dest_k_offset,
             const tensor& src,
             size_t src_k_offset,
             size_t count_k
-    );
+        );
+
     // -----------------------------------------------------------------------------------
 
     }