diff --git a/lang/perl/files/libc.config b/lang/perl/files/libc.config
index 1bfd93f76..2c355a3ce 100644
--- a/lang/perl/files/libc.config
+++ b/lang/perl/files/libc.config
@@ -12,6 +12,10 @@
 }
 
 ($owrt:libc eq 'musl') {
+	# musl does not provide a working setlocale(). It accepts arbitrary locales
+	# and makes them act as if they were C.UTF-8.
+	d_setlocale='undef'
+	
 	d_stdio_ptr_lval='undef'
 	d_stdio_ptr_lval_sets_cnt='undef'
 	d_stdiobase='undef'