diff --git a/sys/x86/isa/atpic.c b/sys/x86/isa/atpic.c
index 5749187778e1..8ad515d8a6c1 100644
--- a/sys/x86/isa/atpic.c
+++ b/sys/x86/isa/atpic.c
@@ -58,6 +58,9 @@ __FBSDID("$FreeBSD$");
 #include <isa/isareg.h>
 #endif
 #include <isa/isavar.h>
+#ifdef DEV_MCA
+#include <i386/bios/mca_machdep.h>
+#endif
 
 #ifdef __amd64__
 #define	SDT_ATPIC	SDT_SYSIGT