diff --git a/sys/amd64/amd64/exception.S b/sys/amd64/amd64/exception.S
index a36375ac6b15..b891c3334bbb 100644
--- a/sys/amd64/amd64/exception.S
+++ b/sys/amd64/amd64/exception.S
@@ -304,6 +304,9 @@ IDTVEC(int0x80_syscall)
 
 ENTRY(fork_trampoline)
  	MTX_EXIT(_sched_lock, %ecx)
+	sti				/* XXX: we need this for kernel threads
+					   created very early before interrupts
+					   are enabled */
 
 #ifdef SMP
 	cmpl	$0,_switchtime
diff --git a/sys/amd64/amd64/exception.s b/sys/amd64/amd64/exception.s
index a36375ac6b15..b891c3334bbb 100644
--- a/sys/amd64/amd64/exception.s
+++ b/sys/amd64/amd64/exception.s
@@ -304,6 +304,9 @@ IDTVEC(int0x80_syscall)
 
 ENTRY(fork_trampoline)
  	MTX_EXIT(_sched_lock, %ecx)
+	sti				/* XXX: we need this for kernel threads
+					   created very early before interrupts
+					   are enabled */
 
 #ifdef SMP
 	cmpl	$0,_switchtime
diff --git a/sys/i386/i386/exception.s b/sys/i386/i386/exception.s
index a36375ac6b15..b891c3334bbb 100644
--- a/sys/i386/i386/exception.s
+++ b/sys/i386/i386/exception.s
@@ -304,6 +304,9 @@ IDTVEC(int0x80_syscall)
 
 ENTRY(fork_trampoline)
  	MTX_EXIT(_sched_lock, %ecx)
+	sti				/* XXX: we need this for kernel threads
+					   created very early before interrupts
+					   are enabled */
 
 #ifdef SMP
 	cmpl	$0,_switchtime