diff --git a/src/zc/sourcefactory/browser/mapping.py b/src/zc/sourcefactory/browser/mapping.py
index 1246574..e2b053f 100644
--- a/src/zc/sourcefactory/browser/mapping.py
+++ b/src/zc/sourcefactory/browser/mapping.py
@@ -22,15 +22,14 @@
 import zc.sourcefactory.mapping
 
 
+@zope.component.adapter(zc.sourcefactory.mapping.ValueMappingSource,
+                        zope.publisher.interfaces.browser.IBrowserRequest)
 @zope.interface.implementer(zope.browser.interfaces.ITerms)
 class MappedTerms(object):
     """A terms implementation that knows how to handle a source that was
     created through a source factory.
     """
 
-    zope.component.adapts(zc.sourcefactory.mapping.ValueMappingSource,
-                          zope.publisher.interfaces.browser.IBrowserRequest)
-
     def __init__(self, source, request):
         self.base = zope.component.getMultiAdapter(
             [source.base, request], zope.browser.interfaces.ITerms)
diff --git a/src/zc/sourcefactory/browser/source.py b/src/zc/sourcefactory/browser/source.py
index 66140c0..6b20fe7 100644
--- a/src/zc/sourcefactory/browser/source.py
+++ b/src/zc/sourcefactory/browser/source.py
@@ -22,16 +22,14 @@
 import zc.sourcefactory.source
 
 
+@zope.component.adapter(zc.sourcefactory.source.FactoredSource,
+                        zope.publisher.interfaces.browser.IBrowserRequest)
 @zope.interface.implementer(zope.browser.interfaces.ITerms)
 class FactoredTerms(object):
     """A terms implementation that knows how to handle a source that was
     created through a source factory.
     """
 
-    zope.component.adapts(
-        zc.sourcefactory.source.FactoredSource,
-        zope.publisher.interfaces.browser.IBrowserRequest)
-
     def __init__(self, source, request):
         self.source = source
         self.request = request
@@ -46,15 +44,13 @@ def getValue(self, token):
         return self.source.factory.getValue(self.source, token)
 
 
+@zope.component.adapter(zc.sourcefactory.source.FactoredContextualSource,
+                        zope.publisher.interfaces.browser.IBrowserRequest)
 class FactoredContextualTerms(FactoredTerms):
     """A terms implementation that knows how to handle a source that was
     created through a contextual source factory.
     """
 
-    zope.component.adapts(
-        zc.sourcefactory.source.FactoredContextualSource,
-        zope.publisher.interfaces.browser.IBrowserRequest)
-
     def getTerm(self, value):
         title = self.source.factory.getTitle(self.source.context, value)
         token = self.source.factory.getToken(self.source.context, value)