diff --git a/py25/bacpypes/iocb.py b/py25/bacpypes/iocb.py
index 3595620..3779de8 100644
--- a/py25/bacpypes/iocb.py
+++ b/py25/bacpypes/iocb.py
@@ -204,7 +204,7 @@ class IOCB(DebugContents):
         if self.ioTimeout:
             self.ioTimeout.suspend_task()
         else:
-            self.ioTimeout = FunctionTask(self.Abort, err)
+            self.ioTimeout = FunctionTask(self.abort, err)
 
         # (re)schedule it
         self.ioTimeout.install_task(_time() + delay)
diff --git a/py27/bacpypes/iocb.py b/py27/bacpypes/iocb.py
index 1b02bc8..32867d7 100644
--- a/py27/bacpypes/iocb.py
+++ b/py27/bacpypes/iocb.py
@@ -205,7 +205,7 @@ class IOCB(DebugContents):
         if self.ioTimeout:
             self.ioTimeout.suspend_task()
         else:
-            self.ioTimeout = FunctionTask(self.Abort, err)
+            self.ioTimeout = FunctionTask(self.abort, err)
 
         # (re)schedule it
         self.ioTimeout.install_task(_time() + delay)
diff --git a/py34/bacpypes/iocb.py b/py34/bacpypes/iocb.py
index 49e8db6..fce079d 100644
--- a/py34/bacpypes/iocb.py
+++ b/py34/bacpypes/iocb.py
@@ -205,7 +205,7 @@ class IOCB(DebugContents):
         if self.ioTimeout:
             self.ioTimeout.suspend_task()
         else:
-            self.ioTimeout = FunctionTask(self.Abort, err)
+            self.ioTimeout = FunctionTask(self.abort, err)
 
         # (re)schedule it
         self.ioTimeout.install_task(_time() + delay)