diff --git a/libc/bionic/mntent.cpp b/libc/bionic/mntent.cpp
index f5a8eaa..4afacda 100644
--- a/libc/bionic/mntent.cpp
+++ b/libc/bionic/mntent.cpp
@@ -27,6 +27,7 @@
  */
 
 #include <mntent.h>
+#include <string.h>
 
 #include "private/ThreadLocalBuffer.h"