diff --git a/heat/engine/function.py b/heat/engine/function.py
index dfac156b3c..9b12dbe333 100644
--- a/heat/engine/function.py
+++ b/heat/engine/function.py
@@ -125,6 +125,9 @@ class Function(object):
             return NotImplemented
         return not eq
 
+    def __hash__(self):
+        return id(self)
+
 
 def resolve(snippet):
     while isinstance(snippet, Function):
diff --git a/heat/engine/resource.py b/heat/engine/resource.py
index 52d35e7886..e65402789e 100644
--- a/heat/engine/resource.py
+++ b/heat/engine/resource.py
@@ -299,6 +299,9 @@ class Resource(object):
             return result
         return not result
 
+    def __hash__(self):
+        return id(self)
+
     def metadata_get(self, refresh=False):
         if refresh:
             self._rsrc_metadata = None
diff --git a/heat/engine/rsrc_defn.py b/heat/engine/rsrc_defn.py
index 805bc30821..ec703dfedf 100644
--- a/heat/engine/rsrc_defn.py
+++ b/heat/engine/rsrc_defn.py
@@ -395,6 +395,13 @@ class ResourceDefinition(ResourceDefinitionCore, collections.Mapping):
 
         raise KeyError(key)
 
+    def __hash__(self):
+        """
+        Return a hash of the ResourceDefinition object.
+        """
+        warnings.warn(self._deprecation_msg, DeprecationWarning)
+        return super(ResourceDefinition, self).__hash__()
+
     def __len__(self):
         """
         Return the number of available CFN template keys.
diff --git a/heat/tests/utils.py b/heat/tests/utils.py
index 0b7caab10b..7f1e48960b 100644
--- a/heat/tests/utils.py
+++ b/heat/tests/utils.py
@@ -126,6 +126,9 @@ class PhysName(object):
         # ignore the stack portion of the name, as it may have been truncated
         return res == self.res
 
+    def __hash__(self):
+        return id(self)
+
     def __ne__(self, physical_name):
         return not self.__eq__(physical_name)