diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index f6cf2e4d6658..4ce6f2d54abf 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -341,9 +341,6 @@ do {									\
 #define	THREAD_LOCKPTR_ASSERT(td, lock)
 #endif
 
-#define	CRITICAL_ASSERT(td)						\
-    KASSERT((td)->td_critnest >= 1, ("Not in critical section"));
-
 /*
  * Flags kept in td_flags:
  * To change these you MUST have the scheduler lock.
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index 61b467936ec3..078f3cdc60e3 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -111,6 +111,12 @@ void	kassert_panic(const char *fmt, ...);
 	KASSERT(sizeof(var) == sizeof(void *) &&			\
 	    ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
 
+/*
+ * Assert that a thread is in critical(9) section.
+ */
+#define	CRITICAL_ASSERT(td)						\
+	KASSERT((td)->td_critnest >= 1, ("Not in critical section"));
+ 
 /*
  * If we have already panic'd and this is the thread that called
  * panic(), then don't block on any mutexes but silently succeed.