Index: leahi_dialin/utils/abstract_classes.py
===================================================================
diff -u -r27cd8e0e7b47617083e8c12f73306f0ba648e687 -r6c90336ac2cd8cf34ac620cff431a847d9ddf557
--- leahi_dialin/utils/abstract_classes.py	(.../abstract_classes.py)	(revision 27cd8e0e7b47617083e8c12f73306f0ba648e687)
+++ leahi_dialin/utils/abstract_classes.py	(.../abstract_classes.py)	(revision 6c90336ac2cd8cf34ac620cff431a847d9ddf557)
@@ -21,7 +21,7 @@
 
 # Project imports
 from leahi_dialin.common.generic_defs import DataTypes
-from leahi_dialin.common.msg_defs import MSG_HEADER_SIZE
+from leahi_dialin.common.constants import MSG_HEADER_SIZE
 
 
 class AbstractObserver(ABC):