diff --git a/tb/test_arp.py b/tb/test_arp.py
index af7e934f..6cc1c06c 100755
--- a/tb/test_arp.py
+++ b/tb/test_arp.py
@@ -67,7 +67,7 @@ def bench():
     s_eth_src_mac = Signal(intbv(0)[48:])
     s_eth_type = Signal(intbv(0)[16:])
     s_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    s_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    s_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     s_eth_payload_axis_tvalid = Signal(bool(0))
     s_eth_payload_axis_tlast = Signal(bool(0))
     s_eth_payload_axis_tuser = Signal(bool(0))
@@ -94,7 +94,7 @@ def bench():
     m_eth_src_mac = Signal(intbv(0)[48:])
     m_eth_type = Signal(intbv(0)[16:])
     m_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    m_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    m_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     m_eth_payload_axis_tvalid = Signal(bool(0))
     m_eth_payload_axis_tlast = Signal(bool(0))
     m_eth_payload_axis_tuser = Signal(bool(0))
diff --git a/tb/test_arp_64.py b/tb/test_arp_64.py
index c3fd7366..5e37a4ff 100755
--- a/tb/test_arp_64.py
+++ b/tb/test_arp_64.py
@@ -67,7 +67,7 @@ def bench():
     s_eth_src_mac = Signal(intbv(0)[48:])
     s_eth_type = Signal(intbv(0)[16:])
     s_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    s_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    s_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     s_eth_payload_axis_tvalid = Signal(bool(0))
     s_eth_payload_axis_tlast = Signal(bool(0))
     s_eth_payload_axis_tuser = Signal(bool(0))
@@ -94,7 +94,7 @@ def bench():
     m_eth_src_mac = Signal(intbv(0)[48:])
     m_eth_type = Signal(intbv(0)[16:])
     m_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    m_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    m_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     m_eth_payload_axis_tvalid = Signal(bool(0))
     m_eth_payload_axis_tlast = Signal(bool(0))
     m_eth_payload_axis_tuser = Signal(bool(0))
diff --git a/tb/test_arp_eth_rx.py b/tb/test_arp_eth_rx.py
index bdea43ea..115463c1 100755
--- a/tb/test_arp_eth_rx.py
+++ b/tb/test_arp_eth_rx.py
@@ -58,7 +58,7 @@ def bench():
     s_eth_src_mac = Signal(intbv(0)[48:])
     s_eth_type = Signal(intbv(0)[16:])
     s_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    s_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    s_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     s_eth_payload_axis_tvalid = Signal(bool(0))
     s_eth_payload_axis_tlast = Signal(bool(0))
     s_eth_payload_axis_tuser = Signal(bool(0))
diff --git a/tb/test_arp_eth_rx_64.py b/tb/test_arp_eth_rx_64.py
index 1fd3d2e3..2ffc9b97 100755
--- a/tb/test_arp_eth_rx_64.py
+++ b/tb/test_arp_eth_rx_64.py
@@ -58,7 +58,7 @@ def bench():
     s_eth_src_mac = Signal(intbv(0)[48:])
     s_eth_type = Signal(intbv(0)[16:])
     s_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    s_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    s_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     s_eth_payload_axis_tvalid = Signal(bool(0))
     s_eth_payload_axis_tlast = Signal(bool(0))
     s_eth_payload_axis_tuser = Signal(bool(0))
diff --git a/tb/test_arp_eth_tx.py b/tb/test_arp_eth_tx.py
index fcb8b421..7066f219 100755
--- a/tb/test_arp_eth_tx.py
+++ b/tb/test_arp_eth_tx.py
@@ -74,7 +74,7 @@ def bench():
     m_eth_src_mac = Signal(intbv(0)[48:])
     m_eth_type = Signal(intbv(0)[16:])
     m_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    m_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    m_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     m_eth_payload_axis_tvalid = Signal(bool(0))
     m_eth_payload_axis_tlast = Signal(bool(0))
     m_eth_payload_axis_tuser = Signal(bool(0))
diff --git a/tb/test_arp_eth_tx_64.py b/tb/test_arp_eth_tx_64.py
index dac15985..1d319167 100755
--- a/tb/test_arp_eth_tx_64.py
+++ b/tb/test_arp_eth_tx_64.py
@@ -74,7 +74,7 @@ def bench():
     m_eth_src_mac = Signal(intbv(0)[48:])
     m_eth_type = Signal(intbv(0)[16:])
     m_eth_payload_axis_tdata = Signal(intbv(0)[DATA_WIDTH:])
-    m_eth_payload_axis_tkeep = Signal(intbv(0)[KEEP_WIDTH:])
+    m_eth_payload_axis_tkeep = Signal(intbv(1)[KEEP_WIDTH:])
     m_eth_payload_axis_tvalid = Signal(bool(0))
     m_eth_payload_axis_tlast = Signal(bool(0))
     m_eth_payload_axis_tuser = Signal(bool(0))