diff --git a/src/pymlab/sensors/atmega.py b/src/pymlab/sensors/atmega.py
index <HASH>..<HASH> 100755
--- a/src/pymlab/sensors/atmega.py
+++ b/src/pymlab/sensors/atmega.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 
-import smbus
+#import smbus
 import time
 
 from pymlab.sensors import Device
diff --git a/src/pymlab/sensors/i2chub.py b/src/pymlab/sensors/i2chub.py
index <HASH>..<HASH> 100755
--- a/src/pymlab/sensors/i2chub.py
+++ b/src/pymlab/sensors/i2chub.py
@@ -3,7 +3,7 @@
 
 import logging
 
-import smbus
+#import smbus
 
 from pymlab.sensors import Device, SimpleBus
 
diff --git a/src/pymlab/sensors/sht25.py b/src/pymlab/sensors/sht25.py
index <HASH>..<HASH> 100755
--- a/src/pymlab/sensors/sht25.py
+++ b/src/pymlab/sensors/sht25.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 
-import smbus
+#import smbus
 import time
 
 from pymlab.sensors import Device
Remove unused smbus imports from some modules.