diff --git a/python/misc_utils/hier_block.py b/python/misc_utils/hier_block.py
new file mode 100644
index 0000000..a3ca1e6
--- /dev/null
+++ b/python/misc_utils/hier_block.py
@@ -0,0 +1,19 @@
+from gnuradio import gr
+from distutils.version import LooseVersion as version
+
+#class created to solve incompatibility of reginstration of message inputs
+#that was introduced in gnuradio 3.7.9
+
+class hier_block(gr.hier_block2):
+    def message_port_register_hier_in(self, port_id):
+        if version(gr.version()) >= version('3.7.9'):
+            super(hier_block, self).message_port_register_hier_in(port_id)
+        else:
+            super(hier_block, self).message_port_register_hier_out(port_id)
+
+    def message_port_register_hier_out(self, port_id):
+        if version(gr.version()) >= version('3.7.9'):
+            super(hier_block, self).message_port_register_hier_out(port_id)
+        else:
+            super(hier_block, self).message_port_register_hier_in(port_id)
+