diff --git a/sys/vm/vm_meter.c b/sys/vm/vm_meter.c
index 4c3d60b3452e..5c20c6703f63 100644
--- a/sys/vm/vm_meter.c
+++ b/sys/vm/vm_meter.c
@@ -55,7 +55,7 @@ __FBSDID("$FreeBSD$");
 /*
  * Virtual memory MPSAFE temporary workarounds.
  */
-#if defined(__amd64__) || defined(__i386__)
+#if defined(__alpha__) || defined(__amd64__) || defined(__i386__)
 int debug_mpsafevm = 1;
 #else
 int debug_mpsafevm;