diff --git a/Modules/_io/stringio.c b/Modules/_io/stringio.c
index c4794c9..a1c31c0 100644
--- a/Modules/_io/stringio.c
+++ b/Modules/_io/stringio.c
@@ -1,6 +1,7 @@
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
 #include "structmember.h"
+#include "accu.h"
 #include "_iomodule.h"
 
 /* Implementation note: the buffer is always at least one character longer
diff --git a/Modules/_json.c b/Modules/_json.c
index cafd5a9..95c658c 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1,5 +1,7 @@
 #include "Python.h"
 #include "structmember.h"
+#include "accu.h"
+
 #if PY_VERSION_HEX < 0x02060000 && !defined(Py_TYPE)
 #define Py_TYPE(ob)     (((PyObject*)(ob))->ob_type)
 #endif