diff --git a/drivers/dahdi/dahdi-base.c b/drivers/dahdi/dahdi-base.c
index f2caad0..305ea67 100644
--- a/drivers/dahdi/dahdi-base.c
+++ b/drivers/dahdi/dahdi-base.c
@@ -66,6 +66,11 @@
 /* Grab fasthdlc with tables */
 #define FAST_HDLC_NEED_TABLES
 #include <dahdi/kernel.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif /* 4.11.0 */
+
 #include "ecdis.h"
 #include "dahdi.h"
 
diff --git a/drivers/dahdi/wcaxx-base.c b/drivers/dahdi/wcaxx-base.c
index 00c2d21..ed7207a 100644
--- a/drivers/dahdi/wcaxx-base.c
+++ b/drivers/dahdi/wcaxx-base.c
@@ -50,6 +50,10 @@
 #include <dahdi/kernel.h>
 #include <dahdi/wctdm_user.h>
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif /* 4.11.0 */
+
 #include "proslic.h"
 
 #include <dahdi/kernel.h>
diff --git a/drivers/dahdi/wctc4xxp/base.c b/drivers/dahdi/wctc4xxp/base.c
index 068f741..0d76d6a 100644
--- a/drivers/dahdi/wctc4xxp/base.c
+++ b/drivers/dahdi/wctc4xxp/base.c
@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/kmod.h>
 #include <linux/sched.h>
+
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
@@ -40,7 +41,12 @@
 
 #include <stdbool.h>
 
-#include "dahdi/kernel.h"
+#include <dahdi/kernel.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif /* 4.11.0 */
+
 
 #include <linux/io.h>
 
diff --git a/drivers/dahdi/wctdm24xxp/base.c b/drivers/dahdi/wctdm24xxp/base.c
index 8ecb125..ad899f8 100644
--- a/drivers/dahdi/wctdm24xxp/base.c
+++ b/drivers/dahdi/wctdm24xxp/base.c
@@ -44,6 +44,7 @@ Tx Gain - W/Pre-Emphasis: -23.99 to 0.00 db
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/sched.h>
+
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
@@ -72,6 +73,10 @@ Tx Gain - W/Pre-Emphasis: -23.99 to 0.00 db
 #include <dahdi/kernel.h>
 #include <dahdi/wctdm_user.h>
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif /* 4.11.0 */
+
 #include "proslic.h"
 
 #include "wctdm24xxp.h"
diff --git a/drivers/dahdi/wcte12xp/base.c b/drivers/dahdi/wcte12xp/base.c
index 2fe74bc..c327c5f 100644
--- a/drivers/dahdi/wcte12xp/base.c
+++ b/drivers/dahdi/wcte12xp/base.c
@@ -40,11 +40,16 @@
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
+
 #include <linux/slab.h>
 
 #include <stdbool.h>
 #include <dahdi/kernel.h>
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif /* 4.11.0 */
+
 #include "wct4xxp/wct4xxp.h"	/* For certain definitions */
 
 #include "voicebus/voicebus.h"
diff --git a/drivers/dahdi/wcte43x-base.c b/drivers/dahdi/wcte43x-base.c
index 3c1b9e5..3e6159b 100644
--- a/drivers/dahdi/wcte43x-base.c
+++ b/drivers/dahdi/wcte43x-base.c
@@ -46,6 +46,10 @@
 #include <stdbool.h>
 #include <dahdi/kernel.h>
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif /* 4.11.0 */
+
 #include "wct4xxp/wct4xxp.h"	/* For certain definitions */
 #include "wcxb.h"
 #include "wcxb_spi.h"