diff --git a/openbr/plugins/imgproc/subtract.cpp b/openbr/plugins/imgproc/subtract.cpp
deleted file mode 100644
index b2adb4c..0000000
--- a/openbr/plugins/imgproc/subtract.cpp
+++ /dev/null
@@ -1,43 +0,0 @@
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Copyright 2012 The MITRE Corporation                                      *
- *                                                                           *
- * Licensed under the Apache License, Version 2.0 (the "License");           *
- * you may not use this file except in compliance with the License.          *
- * You may obtain a copy of the License at                                   *
- *                                                                           *
- *     http://www.apache.org/licenses/LICENSE-2.0                            *
- *                                                                           *
- * Unless required by applicable law or agreed to in writing, software       *
- * distributed under the License is distributed on an "AS IS" BASIS,         *
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
- * See the License for the specific language governing permissions and       *
- * limitations under the License.                                            *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-#include <openbr/plugins/openbr_internal.h>
-
-namespace br
-{
-
-/*!
- * \ingroup transforms
- * \brief Subtract two matrices.
- * \author Josh Klontz \cite jklontz
- */
-class SubtractTransform : public UntrainableMetaTransform
-{
-    Q_OBJECT
-
-    void project(const Template &src, Template &dst) const
-    {
-        if (src.size() != 2) qFatal("Expected exactly two source images, got %d.", src.size());
-        dst.file = src.file;
-        cv::subtract(src[0], src[1], dst);
-    }
-};
-
-BR_REGISTER(Transform, SubtractTransform)
-
-} // namespace br
-
-#include "imgproc/subtract.moc"