diff --git a/kernel/fork.c b/kernel/fork.c
index ef541662ceaa..2b47516b5072 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -79,6 +79,7 @@
 #include <linux/sysctl.h>
 #include <linux/kcov.h>
 #include <linux/cpufreq_times.h>
+#include <linux/simple_lmk.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>