diff --git a/cocotbext/eth/gmii.py b/cocotbext/eth/gmii.py
index 446f0d5..c75a7fa 100644
--- a/cocotbext/eth/gmii.py
+++ b/cocotbext/eth/gmii.py
@@ -365,7 +365,3 @@ class GmiiSink(object):
                     frame.error.append(er_val)
 
             await RisingEdge(self.clock)
-
-
-class GmiiMonitor(GmiiSink):
-    pass
diff --git a/cocotbext/eth/rgmii.py b/cocotbext/eth/rgmii.py
index 152ffa4..731a833 100644
--- a/cocotbext/eth/rgmii.py
+++ b/cocotbext/eth/rgmii.py
@@ -301,7 +301,3 @@ class RgmiiSink(object):
             dv_val = self.ctrl.value.integer
 
             await RisingEdge(self.clock)
-
-
-class RgmiiMonitor(RgmiiSink):
-    pass
diff --git a/cocotbext/eth/xgmii.py b/cocotbext/eth/xgmii.py
index 2d9afcd..8bf5e59 100644
--- a/cocotbext/eth/xgmii.py
+++ b/cocotbext/eth/xgmii.py
@@ -375,7 +375,3 @@ class XgmiiSink(object):
                             frame.ctrl.append(c_val)
 
             await RisingEdge(self.clock)
-
-
-class XgmiiMonitor(XgmiiSink):
-    pass