diff --git a/platform/epay.c b/platform/epay.c
index 0faf145..e34591e 100644
--- a/platform/epay.c
+++ b/platform/epay.c
@@ -236,7 +236,7 @@ static HRESULT misc_read_network_timeout1(void *bytes, uint32_t *nbytes)
 
 static uint64_t thinca_initialize(struct thinca_impl * self, uint64_t val)
 {
-    dprintf("Epay: Thinca Initialize %lld\n", val);
+    dprintf("Epay: Thinca Initialize v%I64X\n", val);
     return 0;
 }