diff --git a/include/bits/stdio.h b/include/bits/stdio.h
index 073ea11203b9e9e963190cac041b1b3fa585937e..16eb100bb47f46f9ddbab354ff7b689350df0c21 100644
--- a/include/bits/stdio.h
+++ b/include/bits/stdio.h
@@ -7,5 +7,8 @@ int fprintf(FILE * stream, const char * fmt, ...);
 int printf(const char * fmt, ...);
 int snprintf(char *s, size_t n, const char * fmt, ...);
 int sprintf(char *s, const char * fmt, ...);
+int fscanf(FILE * stream, const char * fmt, ...);
+int scanf(const char * fmt, ...);
+int sscanf(const char * input, const char * fmt, ...);
 
 #endif /* _BITS_STDIO_H */