diff --git a/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S b/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S
index 8a9caf951a..d7000838d8 100644
--- a/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S
+++ b/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S
@@ -16,7 +16,7 @@
 #include <linux/linkage.h>
 
 .section __xen_guest
-	.ascii	"GUEST_OS=linux,GUEST_VER=2.6,XEN_VER=3.0,VIRT_BASE=0xffffffff80100000"
+	.ascii	"GUEST_OS=linux,GUEST_VER=2.6,XEN_VER=3.0,VIRT_BASE=0xffffffff80000000"
 	.ascii	",LOADER=generic"
 /*	.ascii	",PT_MODE_WRITABLE" */
 	.byte	0
diff --git a/tools/libxc/xc_linux_build.c b/tools/libxc/xc_linux_build.c
index 3692dbd5e5..dc92fff3f6 100644
--- a/tools/libxc/xc_linux_build.c
+++ b/tools/libxc/xc_linux_build.c
@@ -81,8 +81,8 @@ static int setup_guest(int xc_handle,
     int rc;
 
     unsigned long nr_pt_pages;
-    unsigned long ppt_alloc;
-    unsigned long *physmap, *physmap_e, physmap_pfn;
+    unsigned long ppt_alloc, physmap_pfn;
+    u32 *physmap, *physmap_e;
 
     struct load_funcs load_funcs;
     struct domain_setup_info dsi;