diff --git a/src/pl/plperl/plperl.c b/src/pl/plperl/plperl.c
index afebec910d6..6e557fb3363 100644
--- a/src/pl/plperl/plperl.c
+++ b/src/pl/plperl/plperl.c
@@ -300,9 +300,11 @@ static char *strip_trailing_ws(const char *msg);
 static OP  *pp_require_safe(pTHX);
 static void activate_interpreter(plperl_interp_desc *interp_desc);
 
-#ifdef WIN32
+#if defined(WIN32) && PERL_VERSION_LT(5, 28, 0)
 static char *setlocale_perl(int category, char *locale);
-#endif
+#else
+#define setlocale_perl(a,b)  Perl_setlocale(a,b)
+#endif							/* defined(WIN32) && PERL_VERSION_LT(5, 28, 0) */
 
 /*
  * Decrement the refcount of the given SV within the active Perl interpreter
@@ -4034,8 +4036,10 @@ plperl_inline_callback(void *arg)
 /*
  * Perl's own setlocale(), copied from POSIX.xs
  * (needed because of the calls to new_*())
+ *
+ * Starting in 5.28, perl exposes Perl_setlocale to do so.
  */
-#ifdef WIN32
+#if defined(WIN32) && PERL_VERSION_LT(5, 28, 0)
 static char *
 setlocale_perl(int category, char *locale)
 {
@@ -4103,5 +4107,4 @@ setlocale_perl(int category, char *locale)
 
 	return RETVAL;
 }
-
-#endif							/* WIN32 */
+#endif							/* defined(WIN32) && PERL_VERSION_LT(5, 28, 0) */