diff --git a/sys/amd64/amd64/apic_vector.S b/sys/amd64/amd64/apic_vector.S
--- a/sys/amd64/amd64/apic_vector.S
+++ b/sys/amd64/amd64/apic_vector.S
@@ -49,12 +49,6 @@
 #include <machine/specialreg.h>
 #include <x86/apicreg.h>
 
-#ifdef SMP
-#define LK	lock ;
-#else
-#define LK
-#endif
-
 	.text
 	SUPERALIGN_TEXT
 	/* End Of Interrupt to APIC */
diff --git a/sys/amd64/vmm/intel/vmx_support.S b/sys/amd64/vmm/intel/vmx_support.S
--- a/sys/amd64/vmm/intel/vmx_support.S
+++ b/sys/amd64/vmm/intel/vmx_support.S
@@ -32,12 +32,6 @@
 
 #include "vmx_assym.h"
 
-#ifdef SMP
-#define	LK	lock ;
-#else
-#define	LK
-#endif
-
 /* Be friendly to DTrace FBT's prologue/epilogue pattern matching */
 #define VENTER  push %rbp ; mov %rsp,%rbp
 #define VLEAVE  pop %rbp