diff --git a/src/stdio/tmpnam.c b/src/stdio/tmpnam.c
index 92f699c2..c3f5a2ff 100644
--- a/src/stdio/tmpnam.c
+++ b/src/stdio/tmpnam.c
@@ -2,6 +2,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/stat.h>
+#include <string.h>
 #include "syscall.h"
 
 #define MAXTRIES 100