diff --git a/cocotbext/axi/axi_master.py b/cocotbext/axi/axi_master.py
index c91f733..d65274e 100644
--- a/cocotbext/axi/axi_master.py
+++ b/cocotbext/axi/axi_master.py
@@ -778,7 +778,7 @@ class AxiMasterRead(Reset):
 
                     burst_list.append(burst_length)
 
-                    ar = self.r_channel._transaction_obj()
+                    ar = self.ar_channel._transaction_obj()
                     ar.arid = arid
                     ar.araddr = cur_addr
                     ar.arlen = burst_length-1