1 files changed, 1 insertions, 0 deletions
diff --git a/scullv/scullv.h b/scullv/scullv.h
index 8ba2595..3ab2061 100644
--- a/scullv/scullv.h
+++ b/scullv/scullv.h
@@ -15,6 +15,7 @@
 
 #include <linux/ioctl.h>
 #include <linux/cdev.h>
+#include <linux/semaphore.h>
 
 /*
  * Macros to help debugging