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@@ -73,6 +73,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
+#include "thirdparty/pythoncapi_compat.h"
 
 #ifdef HAVE_LIBJPEG
 #include <jconfig.h>
@@ -418,7 +419,7 @@ getbands(const ModeID mode) {
 #define TYPE_DOUBLE (0x400 | sizeof(double))
 
 static void *
-getlist(PyObject *arg, Py_ssize_t *length, const char *wrong_length, int type) {
+getlist_impl(PyObject *arg, Py_ssize_t *length, const char *wrong_length, int type) {
  /* - allocates and returns a c array of the items in the
  python sequence arg.
  - the size of the returned array is in length
@@ -499,6 +500,15 @@ getlist(PyObject *arg, Py_ssize_t *length, const char *wrong_length, int type) {
  return list;
 }
 
+static void *
+getlist(PyObject *arg, Py_ssize_t *length, const char *wrong_length, int type) {
+ void *result;
+ Py_BEGIN_CRITICAL_SECTION(arg);
+ result = getlist_impl(arg, length, wrong_length, type);
+ Py_END_CRITICAL_SECTION();
+ return result;
+}
+
 FLOAT32
 float16tofloat32(const FLOAT16 in) {
  UINT32 t1;