diff --git a/sys/amd64/linux/linux_proto.h b/sys/amd64/linux/linux_proto.h
--- a/sys/amd64/linux/linux_proto.h
+++ b/sys/amd64/linux/linux_proto.h
@@ -7,8 +7,8 @@
 #ifndef _LINUX_SYSPROTO_H_
 #define	_LINUX_SYSPROTO_H_
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>
diff --git a/sys/amd64/linux32/linux32_proto.h b/sys/amd64/linux32/linux32_proto.h
--- a/sys/amd64/linux32/linux32_proto.h
+++ b/sys/amd64/linux32/linux32_proto.h
@@ -7,8 +7,8 @@
 #ifndef _LINUX32_SYSPROTO_H_
 #define	_LINUX32_SYSPROTO_H_
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>
diff --git a/sys/arm64/linux/linux_proto.h b/sys/arm64/linux/linux_proto.h
--- a/sys/arm64/linux/linux_proto.h
+++ b/sys/arm64/linux/linux_proto.h
@@ -7,8 +7,8 @@
 #ifndef _LINUX_SYSPROTO_H_
 #define	_LINUX_SYSPROTO_H_
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>
diff --git a/sys/compat/freebsd32/freebsd32_proto.h b/sys/compat/freebsd32/freebsd32_proto.h
--- a/sys/compat/freebsd32/freebsd32_proto.h
+++ b/sys/compat/freebsd32/freebsd32_proto.h
@@ -7,8 +7,8 @@
 #ifndef _FREEBSD32_SYSPROTO_H_
 #define	_FREEBSD32_SYSPROTO_H_
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>
diff --git a/sys/i386/linux/linux_proto.h b/sys/i386/linux/linux_proto.h
--- a/sys/i386/linux/linux_proto.h
+++ b/sys/i386/linux/linux_proto.h
@@ -7,8 +7,8 @@
 #ifndef _LINUX_SYSPROTO_H_
 #define	_LINUX_SYSPROTO_H_
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>
diff --git a/sys/sys/sysproto.h b/sys/sys/sysproto.h
--- a/sys/sys/sysproto.h
+++ b/sys/sys/sysproto.h
@@ -7,8 +7,8 @@
 #ifndef _SYS_SYSPROTO_H_
 #define	_SYS_SYSPROTO_H_
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>
diff --git a/sys/tools/makesyscalls.lua b/sys/tools/makesyscalls.lua
--- a/sys/tools/makesyscalls.lua
+++ b/sys/tools/makesyscalls.lua
@@ -1431,8 +1431,8 @@
 #ifndef %s
 #define	%s
 
+#include <sys/types.h>
 #include <sys/signal.h>
-#include <sys/acl.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/_ffcounter.h>