diff --git a/src/system/libroot/posix/glibc/include/stdio_private.h b/src/system/libroot/posix/glibc/include/stdio_private.h
index b0dffb49ae..40df0c3e7b 100644
--- a/src/system/libroot/posix/glibc/include/stdio_private.h
+++ b/src/system/libroot/posix/glibc/include/stdio_private.h
@@ -29,6 +29,8 @@ extern int __vsscanf (__const char *__restrict __s,
 		      _G_va_list __arg)
      __attribute__ ((__format__ (__scanf__, 2, 0)));
 
+struct printf_info;
+
 extern int __printf_fp (FILE *fp,
 	 const struct printf_info *info,
 	 const void *const *args);