diff --git a/Include/internal/pycore_pylifecycle.h b/Include/internal/pycore_pylifecycle.h
index b0adc4562c4471..b76bb2c7778aec 100644
--- a/Include/internal/pycore_pylifecycle.h
+++ b/Include/internal/pycore_pylifecycle.h
@@ -82,7 +82,7 @@ extern void _PyFaulthandler_Fini(void);
 extern void _PyHash_Fini(void);
 extern void _PyTraceMalloc_Fini(void);
 extern void _PyWarnings_Fini(PyInterpreterState *interp);
-extern void _PyAST_Fini();
+extern void _PyAST_Fini(void);
 
 extern PyStatus _PyGILState_Init(PyThreadState *tstate);
 extern void _PyGILState_Fini(PyThreadState *tstate);
diff --git a/Python/initconfig.c b/Python/initconfig.c
index 9887079a86fd18..e882a1fba53967 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -2676,7 +2676,7 @@ init_dump_ascii_wstr(const wchar_t *str)
         if (ch == L'\'') {
             PySys_WriteStderr("\\'");
         } else if (0x20 <= ch && ch < 0x7f) {
-            PySys_WriteStderr("%lc", ch);
+            PySys_WriteStderr("%c", ch);
         }
         else if (ch <= 0xff) {
             PySys_WriteStderr("\\x%02x", ch);