diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 04ca5f3..d22b277 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -41,6 +41,7 @@
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
 #include "pycore_fileutils.h"
+#include "pycore_object.h"
 #include "pycore_pystate.h"
 #include "ucnhash.h"
 #include "bytes_methods.h"