diff --git a/src/pdmgen.py b/src/pdmgen.py
index 4a958e1..54790bb 100755
--- a/src/pdmgen.py
+++ b/src/pdmgen.py
@@ -410,8 +410,21 @@
     '''Handle the property watch config file directive.'''
 
     def __init__(self, *a, **kw):
+        self.callback = kw.pop('callback', None)
         super(PropertyWatch, self).__init__(**kw)
 
+    def setup(self, objs):
+        '''Resolve optional callback.'''
+
+        if self.callback:
+            self.callback = get_index(
+                objs,
+                'callback',
+                self.callback,
+                config=self.configfile)
+
+        super(PropertyWatch, self).setup(objs)
+
 
 class Callback(HasPropertyIndex):
     '''Interface and common logic for callbacks.'''