diff --git a/Modules/_xxsubinterpretersmodule.c b/Modules/_xxsubinterpretersmodule.c
index de11c090870f94..8a6fce9e0b4bd9 100644
--- a/Modules/_xxsubinterpretersmodule.c
+++ b/Modules/_xxsubinterpretersmodule.c
@@ -1939,6 +1939,20 @@ _run_script_in_interpreter(PyInterpreterState *interp, const char *codestr,
return -1;
}
+#ifdef EXPERIMENTAL_ISOLATED_SUBINTERPRETERS
+ // Switch to interpreter.
+ PyThreadState *new_tstate = PyInterpreterState_ThreadHead(interp);
+ PyThreadState *save1 = PyEval_SaveThread();
+
+ (void)PyThreadState_Swap(new_tstate);
+
+ // Run the script.
+ _sharedexception *exc = NULL;
+ int result = _run_script(interp, codestr, shared, &exc);
+
+ // Switch back.
+ PyEval_RestoreThread(save1);
+#else
// Switch to interpreter.
PyThreadState *save_tstate = NULL;
if (interp != PyInterpreterState_Get()) {
@@ -1956,6 +1970,7 @@ _run_script_in_interpreter(PyInterpreterState *interp, const char *codestr,
if (save_tstate != NULL) {
PyThreadState_Swap(save_tstate);
}
+#endif
// Propagate any exception out to the caller.
if (exc != NULL) {
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