diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index bed8fbb45f31fb1b8efdf68c319b33fe8b55bab8..6b183521c61697aa3af56082b830247f960d06fb 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -30,6 +30,7 @@
 #include <linux/device.h>	/* for struct device */
 #include <linux/sched.h>	/* for completion */
 #include <linux/mutex.h>
+#include <linux/rtmutex.h>
 #include <linux/irqdomain.h>		/* for Host Notify IRQ */
 #include <linux/of.h>		/* for struct device_node */
 #include <linux/swab.h>		/* for swab16 */
diff --git a/kernel/fork.c b/kernel/fork.c
index 08d6c091ac7cf1350ed7f3f0b3c1eb7c87f7af3b..8fbe8bcd1e200a43bdba7a151bd38618de2c57d8 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -17,6 +17,7 @@
 #include <linux/sched/coredump.h>
 #include <linux/sched/user.h>
 #include <linux/sched/numa_balancing.h>
+#include <linux/rtmutex.h>
 #include <linux/init.h>
 #include <linux/unistd.h>
 #include <linux/module.h>
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 5ea0a8969ee24fc7fb73dff01db54391da6d1aa9..f24582d4dad37bd812f77aa92930cc3c68227497 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -33,6 +33,7 @@
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <uapi/linux/sched/types.h>
+#include <linux/rtmutex.h>
 #include <linux/atomic.h>
 #include <linux/moduleparam.h>
 #include <linux/delay.h>
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index b60f2b6caa1443495f0609eae89b8762a3c89359..ec62a05bfdb3c81b9a82593de2aeefffb96bf300 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -24,6 +24,7 @@
 
 #include <linux/cache.h>
 #include <linux/spinlock.h>
+#include <linux/rtmutex.h>
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 #include <linux/seqlock.h>