1 files changed, 1 insertions, 0 deletions
diff --git a/scullp/scullp.h b/scullp/scullp.h
index 949bd25..d951c76 100644
--- a/scullp/scullp.h
+++ b/scullp/scullp.h
@@ -15,6 +15,7 @@
 
 #include <linux/ioctl.h>
 #include <linux/cdev.h>
+#include <linux/semaphore.h>
 
 /*
  * Macros to help debugging