diff --git a/src/arch/x86/vm.c b/src/arch/x86/vm.c
index 3608919..f125fe6 100644
--- a/src/arch/x86/vm.c
+++ b/src/arch/x86/vm.c
@@ -8,6 +8,7 @@
 #include <linux/kvm_para.h>
 #include <string.h>
 #include <sys/ioctl.h>
+#include <stddef.h>
 
 #include "err.h"
 #include "vm.h"
@@ -131,7 +132,9 @@ int vm_arch_load_image(vm_t *v, void *data, size_t datasz)
     void *kernel = ((uint8_t *) v->mem) + 0x100000;
 
     memset(boot, 0, sizeof(struct boot_params));
-    memmove(boot, data, sizeof(struct boot_params));
+    memmove((void *)boot + offsetof(struct boot_params, hdr),
+            data + offsetof(struct boot_params, hdr),
+            sizeof(struct setup_header));
 
     size_t setup_sectors = boot->hdr.setup_sects;
     size_t setupsz = (setup_sectors + 1) * 512;