diff --git a/sys/amd64/include/proc.h b/sys/amd64/include/proc.h
index 33d5181..126412c 100644
--- a/sys/amd64/include/proc.h
+++ b/sys/amd64/include/proc.h
@@ -53,6 +53,9 @@ struct mdproc {
 	struct system_segment_descriptor md_ldt_sd;
 };
 
+#define KINFO_PROC_SIZE 1088
+#define KINFO_PROC32_SIZE 768
+
 #ifdef	_KERNEL
 
 /* Get the current kernel thread stack usage. */
diff --git a/sys/arm/include/proc.h b/sys/arm/include/proc.h
index c7b2a4e..37051bf 100644
--- a/sys/arm/include/proc.h
+++ b/sys/arm/include/proc.h
@@ -60,4 +60,6 @@ struct mdproc {
 	void	*md_sigtramp;
 };
 
+#define KINFO_PROC_SIZE 792
+
 #endif /* !_MACHINE_PROC_H_ */
diff --git a/sys/i386/include/proc.h b/sys/i386/include/proc.h
index 1e0b9f9..0b9fca2 100644
--- a/sys/i386/include/proc.h
+++ b/sys/i386/include/proc.h
@@ -57,6 +57,8 @@ struct mdproc {
 	struct proc_ldt *md_ldt;	/* (t) per-process ldt */
 };
 
+#define KINFO_PROC_SIZE 768
+
 #ifdef	_KERNEL
 
 /* Get the current kernel thread stack usage. */
diff --git a/sys/ia64/include/proc.h b/sys/ia64/include/proc.h
index 6bf9c78..81e2e4f 100644
--- a/sys/ia64/include/proc.h
+++ b/sys/ia64/include/proc.h
@@ -38,4 +38,7 @@ struct mdproc {
 	int		__dummy;	/* Avoid having an empty struct. */
 };
 
+#define KINFO_PROC_SIZE 1088
+#define KINFO_PROC32_SIZE 768
+
 #endif /* !_MACHINE_PROC_H_ */
diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index d4943c0..5601ecf 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -151,6 +151,9 @@ int kstack_pages = KSTACK_PAGES;
 SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "");
 
 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
+#ifdef COMPAT_FREEBSD32
+CTASSERT(sizeof(struct kinfo_proc32) == KINFO_PROC32_SIZE);
+#endif
 
 /*
  * Initialize global process hashing structures.
diff --git a/sys/mips/include/proc.h b/sys/mips/include/proc.h
index 0491b11..1479eda 100644
--- a/sys/mips/include/proc.h
+++ b/sys/mips/include/proc.h
@@ -68,4 +68,10 @@ struct thread;
 void	mips_cpu_switch(struct thread *, struct thread *, struct mtx *);
 void	mips_cpu_throw(struct thread *, struct thread *);
 
+#ifdef __mips_n64
+#define KINFO_PROC_SIZE 1088
+#else
+#define KINFO_PROC_SIZE 816
+#endif
+
 #endif	/* !_MACHINE_PROC_H_ */
diff --git a/sys/powerpc/include/proc.h b/sys/powerpc/include/proc.h
index c958fb7..cbe6da9 100644
--- a/sys/powerpc/include/proc.h
+++ b/sys/powerpc/include/proc.h
@@ -46,4 +46,6 @@ struct mdthread {
 struct mdproc {
 };
 
+#define KINFO_PROC_SIZE 768
+
 #endif /* !_MACHINE_PROC_H_ */
diff --git a/sys/sparc64/include/proc.h b/sys/sparc64/include/proc.h
index bfd1268..84eaed5 100644
--- a/sys/sparc64/include/proc.h
+++ b/sys/sparc64/include/proc.h
@@ -51,4 +51,6 @@ struct mdproc {
 	void	*md_sigtramp;
 };
 
+#define KINFO_PROC_SIZE 1088
+
 #endif /* !_MACHINE_PROC_H_ */
diff --git a/sys/sun4v/include/proc.h b/sys/sun4v/include/proc.h
index bfd1268..84eaed5 100644
--- a/sys/sun4v/include/proc.h
+++ b/sys/sun4v/include/proc.h
@@ -51,4 +51,6 @@ struct mdproc {
 	void	*md_sigtramp;
 };
 
+#define KINFO_PROC_SIZE 1088
+
 #endif /* !_MACHINE_PROC_H_ */
diff --git a/sys/sys/user.h b/sys/sys/user.h
index d5e46fe..34635e3 100644
--- a/sys/sys/user.h
+++ b/sys/sys/user.h
@@ -87,34 +87,11 @@
 #define	KI_NSPARE_LONG	12
 #define	KI_NSPARE_PTR	7
 
-#ifdef __amd64__
-#define	KINFO_PROC_SIZE	1088
-#endif
-#ifdef __arm__
-#define	KINFO_PROC_SIZE	792
-#endif
-#ifdef __ia64__
-#define	KINFO_PROC_SIZE 1088
-#endif
-#ifdef __i386__
-#define	KINFO_PROC_SIZE	768
-#endif
-#ifdef __mips__
-#ifdef __mips_n64
-#define	KINFO_PROC_SIZE	1088
-#else
-#define	KINFO_PROC_SIZE	816
-#endif
-#endif
-#ifdef __powerpc__
-#define	KINFO_PROC_SIZE	768
-#endif
-#ifdef __sparc64__
-#define	KINFO_PROC_SIZE 1088
-#endif
+#ifndef _KERNEL
 #ifndef KINFO_PROC_SIZE
 #error "Unknown architecture"
 #endif
+#endif /* !_KERNEL */
 
 #define	WMESGLEN	8		/* size of returned wchan message */
 #define	LOCKNAMELEN	8		/* size of returned lock name */