diff --git a/include/unistd.h b/include/unistd.h
index 56e9ae5..35132df 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -72,4 +72,6 @@ int execv(const char *, char *const []);
 int execve(const char *, char *const [], char *const []);
 int execvp(const char *, char *const []);
 
+int gethostname(char *, size_t);
+
 #endif