diff --git a/src/lib9/fmtlock2.c b/src/lib9/fmtlock2.c
new file mode 100644
index 00000000..d56eed74
--- /dev/null
+++ b/src/lib9/fmtlock2.c
@@ -0,0 +1,16 @@
+#include <u.h>
+#include <libc.h>
+
+static QLock fmtlock;
+
+void
+__fmtlock(void)
+{
+	qlock(&fmtlock);
+}
+
+void
+__fmtunlock(void)
+{
+	qunlock(&fmtlock);
+}