diff --git a/dvb-core/dvb_ca_en50221.c b/dvb-core/dvb_ca_en50221.c
index 2c0bdfe..cefe881 100644
--- a/dvb-core/dvb_ca_en50221.c
+++ b/dvb-core/dvb_ca_en50221.c
@@ -35,6 +35,7 @@
 #include <linux/vmalloc.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
+#include <linux/version.h>
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0))
 #include <linux/sched/signal.h>
 #else
diff --git a/dvb-core/dvb_demux.c b/dvb-core/dvb_demux.c
index 4560db0..43d4fcf 100644
--- a/dvb-core/dvb_demux.c
+++ b/dvb-core/dvb_demux.c
@@ -21,6 +21,7 @@
  *
  */
 
+#include <linux/version.h>
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0))
 #include <linux/sched/signal.h>
 #else
diff --git a/dvb-core/dvb_frontend.h b/dvb-core/dvb_frontend.h
index 6883a61..1a1af78 100644
--- a/dvb-core/dvb_frontend.h
+++ b/dvb-core/dvb_frontend.h
@@ -29,6 +29,7 @@
 #define _DVB_FRONTEND_H_
 
 #include <linux/types.h>
+#include <linux/version.h>
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0))
 #include <linux/sched/signal.h>
 #else