diff --git a/src/Type.h b/src/Type.h
index cae2429719..fc5e1aa6c9 100644
--- a/src/Type.h
+++ b/src/Type.h
@@ -920,6 +920,12 @@ inline bool IsVector(TypeTag t)	{ return (t == TYPE_VECTOR); }
 // True if the given type type is a string.
 inline bool IsString(TypeTag t)	{ return (t == TYPE_STRING); }
 
+// True if the given type is a container aggregate.
+inline bool IsAggr(TypeTag tag)
+	{
+	return tag == TYPE_VECTOR || tag == TYPE_TABLE || tag == TYPE_RECORD;
+	}
+
 // True if the given type tag corresponds to the error type.
 inline bool IsErrorType(TypeTag t)	{ return (t == TYPE_ERROR); }