diff --git a/python/port/genhdr/qstrdefs.in.h b/python/port/genhdr/qstrdefs.in.h
index 5c2c32966..98ab81234 100644
--- a/python/port/genhdr/qstrdefs.in.h
+++ b/python/port/genhdr/qstrdefs.in.h
@@ -181,6 +181,7 @@ Q(format)
 Q(frexp)
 Q(from_bytes)
 Q(fromkeys)
+Q(frozenset)
 Q(function)
 Q(gamma)
 Q(generator)
diff --git a/python/port/mpconfigport.h b/python/port/mpconfigport.h
index 74726e038..3fd89d9a4 100644
--- a/python/port/mpconfigport.h
+++ b/python/port/mpconfigport.h
@@ -44,6 +44,9 @@
 // Whether to support bytearray object
 #define MICROPY_PY_BUILTINS_BYTEARRAY (0)
 
+// Whether to support frozenset object
+#define MICROPY_PY_BUILTINS_FROZENSET (1)
+
 // Whether to support property object
 #define MICROPY_PY_BUILTINS_PROPERTY (0)