diff --git a/protocols/bmv2/thrift-api/src/patch.sh b/protocols/bmv2/thrift-api/src/patch.sh
new file mode 100755
index 0000000..7f7ffb9
--- /dev/null
+++ b/protocols/bmv2/thrift-api/src/patch.sh
@@ -0,0 +1,29 @@
+#! /bin/bash
+#
+# Copyright 2014-2016 Open Networking Laboratory
+#
+# 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.
+
+# exit on errors
+set -e
+
+srcdir=$1
+ns=$2
+
+# add java namespace at beginning of file
+for f in ${srcdir}/*.thrift
+do
+    if ! grep -q ${ns} ${f}; then
+        echo "namespace java ${ns}" | cat - ${f} > temp && mv temp ${f}
+    fi
+done
\ No newline at end of file