diff --git a/sys/amd64/include/vmm_dev.h b/sys/amd64/include/vmm_dev.h
--- a/sys/amd64/include/vmm_dev.h
+++ b/sys/amd64/include/vmm_dev.h
@@ -54,13 +54,6 @@
 	char		name[VM_MAX_SUFFIXLEN + 1];
 };
 
-struct vm_memseg_fbsd12 {
-	int		segid;
-	size_t		len;
-	char		name[64];
-};
-_Static_assert(sizeof(struct vm_memseg_fbsd12) == 80, "COMPAT_FREEBSD12 ABI");
-
 struct vm_register {
 	int		cpuid;
 	int		regnum;		/* enum vm_reg_name */
@@ -349,12 +342,8 @@
 	_IOW('v', IOCNUM_SUSPEND, struct vm_suspend)
 #define	VM_REINIT	\
 	_IO('v', IOCNUM_REINIT)
-#define	VM_ALLOC_MEMSEG_FBSD12	\
-	_IOW('v', IOCNUM_ALLOC_MEMSEG, struct vm_memseg_fbsd12)
 #define	VM_ALLOC_MEMSEG	\
 	_IOW('v', IOCNUM_ALLOC_MEMSEG, struct vm_memseg)
-#define	VM_GET_MEMSEG_FBSD12	\
-	_IOWR('v', IOCNUM_GET_MEMSEG, struct vm_memseg_fbsd12)
 #define	VM_GET_MEMSEG	\
 	_IOWR('v', IOCNUM_GET_MEMSEG, struct vm_memseg)
 #define	VM_MMAP_MEMSEG	\
diff --git a/sys/dev/vmm/vmm_dev.c b/sys/dev/vmm/vmm_dev.c
--- a/sys/dev/vmm/vmm_dev.c
+++ b/sys/dev/vmm/vmm_dev.c
@@ -28,6 +28,20 @@
 #include <dev/vmm/vmm_dev.h>
 #include <dev/vmm/vmm_stat.h>
 
+#if defined(__amd64__) && defined(COMPAT_FREEBSD12)
+struct vm_memseg_fbsd12 {
+	int		segid;
+	size_t		len;
+	char		name[64];
+};
+_Static_assert(sizeof(struct vm_memseg_fbsd12) == 80, "COMPAT_FREEBSD12 ABI");
+
+#define	VM_ALLOC_MEMSEG_FBSD12	\
+	_IOW('v', IOCNUM_ALLOC_MEMSEG, struct vm_memseg_fbsd12)
+#define	VM_GET_MEMSEG_FBSD12	\
+	_IOWR('v', IOCNUM_GET_MEMSEG, struct vm_memseg_fbsd12)
+#endif
+
 static int devmem_create_cdev(const char *vmname, int id, char *devmem);
 
 struct devmem_softc {