diff --git a/include/stdlib/stdio.h b/include/stdlib/stdio.h
index 517158a..f59a115 100644
--- a/include/stdlib/stdio.h
+++ b/include/stdlib/stdio.h
@@ -59,6 +59,7 @@
 #define	EOF	(-1)
 
 int	 printf(const char * __restrict, ...);
+int	 putchar(int);
 int	 puts(const char *);
 int	 sprintf(char * __restrict, const char * __restrict, ...);
 int	 vsprintf(char * __restrict, const char * __restrict,
diff --git a/include/stdlib/string.h b/include/stdlib/string.h
index 12b1000..832d764 100644
--- a/include/stdlib/string.h
+++ b/include/stdlib/string.h
@@ -55,6 +55,7 @@
 void	*memmove(void *, const void *, size_t);
 void	*memset(void *, int, size_t);
 
+char	*strchr(const char *, int) __pure;
 size_t	 strlen(const char *) __pure;
 
 __END_DECLS