Atomic reference counting

1 files changed, 1 insertions, 0 deletions

diff --git a/lexer.c b/lexer.c
index f684e51..198bd42 100644
--- a/lexer.c
+++ b/lexer.c
@@ -1,6 +1,7 @@
 #include <u.h>
 #include <libc.h>
 #include <bio.h>
+#include <thread.h>
 
 #include "apl9.h"