diff --git a/tools/libxl/libxl_x86.c b/tools/libxl/libxl_x86.c
index f8bc828e62..e57f63282e 100644
--- a/tools/libxl/libxl_x86.c
+++ b/tools/libxl/libxl_x86.c
@@ -391,7 +391,7 @@ static int hvm_set_conf_params(libxl__gc *gc, uint32_t domid,
     libxl_ctx *ctx = libxl__gc_owner(gc);
     xc_interface *xch = ctx->xch;
     int ret = ERROR_FAIL;
-    bool altp2m = info->altp2m;
+    unsigned int altp2m = info->altp2m;
 
     switch(info->type) {
     case LIBXL_DOMAIN_TYPE_HVM: