diff --git a/openbr/plugins/regions.cpp b/openbr/plugins/regions.cpp
index 512cbab..317eb54 100644
--- a/openbr/plugins/regions.cpp
+++ b/openbr/plugins/regions.cpp
@@ -53,6 +53,7 @@ class RectRegionsTransform : public UntrainableTransform
                 dst += m(Rect(x, y, width, height));
     }
 };
+BR_REGISTER(Transform, RectRegionsTransform)
 
 /*!
  * \ingroup transforms