diff --git a/meta/cretonne/__init__.py b/meta/cretonne/__init__.py
index ecfea17989..c79e0f7bdc 100644
--- a/meta/cretonne/__init__.py
+++ b/meta/cretonne/__init__.py
@@ -237,11 +237,15 @@ variable_args = OperandKind(
 class ImmediateKind(OperandKind):
     """
     The kind of an immediate instruction operand.
+
+    :param default_member: The default member name of this kind the
+                           `InstructionData` data structure.
     """
 
-    def __init__(self, name, doc):
+    def __init__(self, name, doc, default_member='imm'):
         self.name = name
         self.__doc__ = doc
+        self.default_member = default_member
 
     def __repr__(self):
         return 'ImmediateKind({})'.format(self.name)
diff --git a/meta/cretonne/immediates.py b/meta/cretonne/immediates.py
index 61ba418c9c..ca8affded0 100644
--- a/meta/cretonne/immediates.py
+++ b/meta/cretonne/immediates.py
@@ -34,11 +34,16 @@ immvector = ImmediateKind('immvector', 'An immediate SIMD vector.')
 #:
 #: This enumerated operand kind is used for the :cton:inst:`icmp` instruction
 #: and corresponds to the `condcodes::IntCC` Rust type.
-intcc = ImmediateKind('intcc', 'An integer comparison condition code.')
+intcc = ImmediateKind(
+        'intcc',
+        'An integer comparison condition code.',
+        default_member='cond')
 
 #: A condition code for comparing floating point values.
 #:
 #: This enumerated operand kind is used for the :cton:inst:`fcmp` instruction
 #: and corresponds to the `condcodes::FloatCC` Rust type.
 floatcc = ImmediateKind(
-        'floatcc', 'A floating point comparison condition code.')
+        'floatcc',
+        'A floating point comparison condition code.',
+        default_member='cond')