diff --git a/src/libs/compat/freebsd_network/compat/sys/mutex.h b/src/libs/compat/freebsd_network/compat/sys/mutex.h
index dd1ce55755..c4c2a701bf 100644
--- a/src/libs/compat/freebsd_network/compat/sys/mutex.h
+++ b/src/libs/compat/freebsd_network/compat/sys/mutex.h
@@ -9,6 +9,7 @@
 
 #include <sys/_mutex.h>
 #include <sys/systm.h>
+#include <sys/pcpu.h>
 
 
 #define MA_OWNED		0x1