diff --git a/lib/libc/stdio/fgetwc.c b/lib/libc/stdio/fgetwc.c
index d8b10a1e56a..719556ad9e1 100644
--- a/lib/libc/stdio/fgetwc.c
+++ b/lib/libc/stdio/fgetwc.c
@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 #include "local.h"
+#include "mblocal.h"
 
 /*
  * MT-safe version.
@@ -70,7 +71,7 @@ __fgetwc(FILE *fp)
 		return (wc);
 	}
 	do {
-		nconv = mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate);
+		nconv = __mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate);
 		if (nconv == (size_t)-1)
 			break;
 		else if (nconv == (size_t)-2)
diff --git a/lib/libc/stdio/fputwc.c b/lib/libc/stdio/fputwc.c
index 3f3984db1f1..0848b74998d 100644
--- a/lib/libc/stdio/fputwc.c
+++ b/lib/libc/stdio/fputwc.c
@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 #include "local.h"
+#include "mblocal.h"
 
 /*
  * Non-MT-safe version.
@@ -55,7 +56,7 @@ __fputwc(wchar_t wc, FILE *fp)
 		*buf = (unsigned char)wc;
 		len = 1;
 	} else {
-		if ((len = wcrtomb(buf, wc, &fp->_extra->mbstate)) ==
+		if ((len = __wcrtomb(buf, wc, &fp->_extra->mbstate)) ==
 		    (size_t)-1) {
 			fp->_flags |= __SERR;
 			return (WEOF);
diff --git a/lib/libc/stdio/ungetwc.c b/lib/libc/stdio/ungetwc.c
index 28f873c53b4..bae2c3ebcea 100644
--- a/lib/libc/stdio/ungetwc.c
+++ b/lib/libc/stdio/ungetwc.c
@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 #include "local.h"
+#include "mblocal.h"
 
 /*
  * Non-MT-safe version.
@@ -47,7 +48,7 @@ __ungetwc(wint_t wc, FILE *fp)
 
 	if (wc == WEOF)
 		return (WEOF);
-	if ((len = wcrtomb(buf, wc, &fp->_extra->mbstate)) == (size_t)-1) {
+	if ((len = __wcrtomb(buf, wc, &fp->_extra->mbstate)) == (size_t)-1) {
 		fp->_flags |= __SERR;
 		return (WEOF);
 	}