diff --git a/tools/python/xen/lowlevel/xu/xu.c b/tools/python/xen/lowlevel/xu/xu.c
index 65660ba6dc..cd616e75bc 100644
--- a/tools/python/xen/lowlevel/xu/xu.c
+++ b/tools/python/xen/lowlevel/xu/xu.c
@@ -72,7 +72,7 @@ static void set_cloexec(int fd)
 
 static int xcs_ctrl_fd = -1; /* control connection to the xcs server. */
 static int xcs_data_fd = -1; /*    data connection to the xcs server. */
-static u32 xcs_session_id = 0;
+static unsigned long  xcs_session_id = 0;
 
 static int xcs_ctrl_send(xcs_msg_t *msg);
 static int xcs_ctrl_read(xcs_msg_t *msg);
diff --git a/tools/xcs/xcs_proto.h b/tools/xcs/xcs_proto.h
index fa04621f40..7038467c90 100644
--- a/tools/xcs/xcs_proto.h
+++ b/tools/xcs/xcs_proto.h
@@ -40,7 +40,7 @@
 #define TYPE_VIRQ      0xfffe
 
 typedef struct {
-    u32 session_id;
+    unsigned long  session_id;
 } xcs_connect_msg_t;
 
 typedef struct {