diff --git a/include/stdlib/string.h b/include/stdlib/string.h
index 00a5dcd..61e8102 100644
--- a/include/stdlib/string.h
+++ b/include/stdlib/string.h
@@ -59,6 +59,7 @@
 int	 strcmp(const char *, const char *) __pure;
 size_t	 strlen(const char *) __pure;
 int	 strncmp(const char *, const char *, size_t) __pure;
+int	 strcasecmp(const char *, const char *);
 
 __END_DECLS