diff --git a/ssl/d1_lib.c b/ssl/d1_lib.c
index e75d049..4ca6bb3 100644
--- a/ssl/d1_lib.c
+++ b/ssl/d1_lib.c
@@ -528,7 +528,7 @@
 # ifdef  __MINGW32__
     now.ul -= 116444736000000000ULL;
 # else
-    now.ul -= 116444736000000000U I64; /* re-bias to 1/1/1970 */
+    now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */
 # endif
     t->tv_sec = (long)(now.ul / 10000000);
     t->tv_usec = ((int)(now.ul % 10000000)) / 10;