diff --git a/src/misc.c b/src/misc.c
index 4d59cc5c0..b914e37d6 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -3076,7 +3076,7 @@ int rig_test_2038(RIG *rig)
 
     int failed = 0;
 #if defined(__MSVCRT_VERSION__)
-    x = (__time64_t)((1U << 31) - 1);
+    x = (__time64_t)((1UL << 31) - 1);
     char s[64];
     _ctime64_s(s, sizeof(s), &x);