diff --git a/configure.ac b/configure.ac
index 1c8a5279..6c63c609 100644
--- a/configure.ac
+++ b/configure.ac
@@ -668,7 +668,7 @@ case "$target" in
   ;;
 esac
 
-AC_CHECK_FUNCS([atexit atoll chdir chmod delscreen dirname dup2 execv ftruncate fsync getcwd geteuid lstat memalign memset mkdir posix_fadvise posix_memalign pwrite readlink setenv setlocale sigaction signal sleep snprintf strchr strdup strerror strncasecmp strtol touchwin utime vsnprintf])
+AC_CHECK_FUNCS([atexit atoll chdir chmod delscreen dirname dup2 execv ftruncate fsync getcwd geteuid lstat memalign memset mkdir posix_fadvise posix_memalign pwrite readlink setenv setlocale sigaction signal sleep snprintf strchr strdup strerror strncasecmp strtol touchwin utime vsnprintf wctomb])
 if test "$ac_cv_func_mkdir" = "no"; then
   AC_MSG_ERROR(No mkdir function detected)
 fi
diff --git a/src/fat_dir.c b/src/fat_dir.c
index 2e83ff3a..8b80a7ca 100644
--- a/src/fat_dir.c
+++ b/src/fat_dir.c
@@ -81,7 +81,9 @@ file_data_t *dir_fat_aux(const unsigned char*buffer, const unsigned int size, co
   unsigned int status;
   unsigned int inode;
   int utf8=1;
+#ifdef HAVE_WCTOMB
   wctomb(NULL, 0);
+#endif
 GetNew:
   status=0;
   long_slots = 0;
@@ -264,7 +266,11 @@ RecEnd:
       {
 	if(utf8 && unicode[i]>0x7f)
 	{
+#ifdef HAVE_WCTOMB
 	  const int sizec=wctomb(&new_file->name[o], unicode[i]);
+#else
+	  const int sizec=unicode[i];
+#endif
 	  if(sizec <= 0)
 	  {
 	    new_file->name[o]=(char) unicode[i];