diff --git a/test/test_axi.py b/test/test_axi.py
index 4111e68..3f2f012 100755
--- a/test/test_axi.py
+++ b/test/test_axi.py
@@ -201,19 +201,19 @@ class TestAXI(unittest.TestCase):
         writes = []
         for i in range(16):
             if with_random:
-                # incrementing addr, random data &id
-                writes.append(Write(i, [prng.randrange(2**32) for _ in range(i+1)], prng.randrange(2**8), type=0b00, len=i))
+                # incrementing addr, random data & id
+                writes.append(Write(i, [prng.randrange(2**32) for _ in range(i+1)], prng.randrange(2**8), type=0b00, len=i, size=log2_int(32//8)))
             else:
                 # incrementing addr, data & id (debug)
-                writes.append(Write(i, [i for _ in range(i+1)], i, type=0b00, len=i))
+                writes.append(Write(i, [i for _ in range(i+1)], i, type=0b00, len=i, size=log2_int(32//8)))
         reads = []
         for i in range(16):
             if with_random:
                 # incrementing addr, written data, random id
-                reads.append(Read(i, writes[i].data, prng.randrange(2**8), type=0b00, len=len(writes[i].data)-1))
+                reads.append(Read(i, writes[i].data, prng.randrange(2**8), type=0b00, len=len(writes[i].data)-1, size=log2_int(32//8)))
             else:
                 # incrementing addr, written data, incrementing id (debug)
-                reads.append(Read(i, writes[i].data, i, type=0b00, len=len(writes[i].data)-1))
+                reads.append(Read(i, writes[i].data, i, type=0b00, len=len(writes[i].data)-1), size=log2_int(32//8))
 
         # simulation
         generators = [