diff --git a/usr/include/stdio.h b/usr/include/stdio.h
index f24ab69..21243cc 100644
--- a/usr/include/stdio.h
+++ b/usr/include/stdio.h
@@ -95,6 +95,7 @@
 __extern int ferror(FILE * );
 __extern int feof(FILE *);
 __extern int fileno(FILE *);
+__extern void clearerr(FILE *);
 
 #ifndef __NO_STDIO_INLINES
 __extern_inline size_t