diff --git a/sys/compat/linuxkpi/common/include/linux/time.h b/sys/compat/linuxkpi/common/include/linux/time.h
index 2b69ec46935c..a1c18d6879ca 100644
--- a/sys/compat/linuxkpi/common/include/linux/time.h
+++ b/sys/compat/linuxkpi/common/include/linux/time.h
@@ -42,6 +42,8 @@
 #include <sys/time.h>
 #include <sys/stdint.h>
 
+#include <linux/math64.h>
+
 static inline struct timeval
 ns_to_timeval(const int64_t nsec)
 {