diff --git a/src/macros.py b/src/macros.py
index d6ba2ca..1533741 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -112,6 +112,11 @@
 macro IS_UNDETECTABLE(arg)      = (%_IsUndetectableObject(arg));
 macro FLOOR(arg)                = $floor(arg);
 
+# Macro for ECMAScript 5 queries of the type:
+# "Type(O) is object."
+# This is the same as being either a function or an object in V8 terminology.
+macro IS_SPEC_OBJECT_OR_NULL(arg) = (%_IsObject(arg) || %_IsFunction(arg));
+
 # Inline macros. Use %IS_VAR to make sure arg is evaluated only once.
 macro NUMBER_IS_NAN(arg) = (!%_IsSmi(%IS_VAR(arg)) && !(arg == arg));
 macro TO_INTEGER(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : ToInteger(arg));