diff --git a/sys/amd64/linux/linux_support.s b/sys/amd64/linux/linux_support.s
index bb1c218bdf89..79e361867f1d 100644
--- a/sys/amd64/linux/linux_support.s
+++ b/sys/amd64/linux/linux_support.s
@@ -30,6 +30,7 @@
 
 #include "linux_assym.h"		/* system definitions */
 #include <machine/asmacros.h>		/* miscellaneous asm macros */
+#include <machine/specialreg.h>
 
 #include "assym.inc"
 
diff --git a/sys/amd64/linux32/linux32_support.s b/sys/amd64/linux32/linux32_support.s
index 86f3d11b552b..2e2dbca4e24b 100644
--- a/sys/amd64/linux32/linux32_support.s
+++ b/sys/amd64/linux32/linux32_support.s
@@ -30,6 +30,7 @@
 
 #include "linux32_assym.h"		/* system definitions */
 #include <machine/asmacros.h>		/* miscellaneous asm macros */
+#include <machine/specialreg.h>
 
 #include "assym.inc"