diff --git a/memide.c b/memide.c
index 63f0a24..ba267ac 100644
--- a/memide.c
+++ b/memide.c
@@ -9,6 +9,7 @@
 #include "x86.h"
 #include "traps.h"
 #include "spinlock.h"
+#include "sleeplock.h"
 #include "fs.h"
 #include "buf.h"