diff --git a/dstat-interface/dstat-interface/dstat_comm.py b/dstat-interface/dstat-interface/dstat_comm.py
index d7012870593907ac3e22da44f5a2e0735fd67e37..ff4dab024f5949b782e6625d80b2dce11b388985 100644
--- a/dstat-interface/dstat-interface/dstat_comm.py
+++ b/dstat-interface/dstat-interface/dstat_comm.py
@@ -29,7 +29,7 @@ class delayedSerial(serial.Serial):
             serial.Serial.write(self, i)
             time.sleep(.001)
 
-class SerialDevices:
+class SerialDevices(object):
     """Retrieves and stores list of serial devices in self.ports"""
     def __init__(self):
         try:
@@ -42,7 +42,7 @@ class SerialDevices:
         """Refreshes list of ports."""
         self.ports, _, _ = zip(*list_ports.comports())
 
-class Experiment:
+class Experiment(object):
     """Store and acquire a potentiostat experiment. Meant to be subclassed
     to by different experiment types and not used instanced directly.
     """
diff --git a/dstat-interface/dstat-interface/main.py b/dstat-interface/dstat-interface/main.py
index 0411d19772589d477bf2f422bb26b8f63c3db41f..c8c98429974a1d058446516b8d68ade1b6d8831d 100644
--- a/dstat-interface/dstat-interface/main.py
+++ b/dstat-interface/dstat-interface/main.py
@@ -47,7 +47,7 @@ class InputError(Error):
         self.expr = expr
         self.msg = msg
 
-class Main:
+class Main(object):
     """Main program """
     def __init__(self):
         self.builder = gtk.Builder()
diff --git a/dstat-interface/dstat-interface/microdrop.py b/dstat-interface/dstat-interface/microdrop.py
index 917ef2c70814deea3b78cfa0b9a0a61604ba9ffc..8546ad38a13fccc093f49b27f2ef290979e958f3 100644
--- a/dstat-interface/dstat-interface/microdrop.py
+++ b/dstat-interface/dstat-interface/microdrop.py
@@ -14,7 +14,7 @@ INVAL_CMD = "99"
 RECV = 0
 SEND = 1
 
-class microdropConnection:
+class microdropConnection(object):
     """Manages microdrop connection over TCP with zmq"""
     def __init__(self, port=6789):
         """Create zmq context and bind to port. Should be called manually
diff --git a/dstat-interface/dstat-interface/mpltest.py b/dstat-interface/dstat-interface/mpltest.py
index 762449945bdaa56ed58e045f42a3d776b83916af..59e53922f4271278cf56079b117d205398cc53f9 100644
--- a/dstat-interface/dstat-interface/mpltest.py
+++ b/dstat-interface/dstat-interface/mpltest.py
@@ -14,7 +14,7 @@ from matplotlib.backends.backend_gtkagg \
 from matplotlib.backends.backend_gtkagg \
     import NavigationToolbar2GTKAgg as NavigationToolbar
 
-class plotbox:
+class plotbox(object):
     """Contains main data plot and associated methods."""
     def __init__(self, plotwindow_instance):
         """Creates plot and moves it to a gtk container.