diff --git a/drivers/staging/ath6kl/os/linux/include/osapi_linux.h b/drivers/staging/ath6kl/os/linux/include/osapi_linux.h
index ef7cc827cfb441203f523cdc299d0d4dfc655cc9..fce6ceb73fa4bff1dfc88b59458b5244bb72c93a 100644
--- a/drivers/staging/ath6kl/os/linux/include/osapi_linux.h
+++ b/drivers/staging/ath6kl/os/linux/include/osapi_linux.h
@@ -39,7 +39,7 @@
 #include <linux/timer.h>
 #include <linux/delay.h>
 #include <linux/wait.h>
-
+#include <linux/semaphore.h>
 #include <linux/cache.h>
 
 #ifdef __GNUC__