diff --git a/lib/mktime.c b/lib/mktime.c
index e5e7c745d..34112a9a0 100644
--- a/lib/mktime.c
+++ b/lib/mktime.c
@@ -75,8 +75,10 @@
 #endif
 
 #ifndef TIME_T_MIN
-#define TIME_T_MIN (0 < (time_t) -1 ? (time_t) 0 \
-		    : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
+/* The outer cast to time_t works around a bug in Cray C 5.0.3.0.  */
+#define TIME_T_MIN ((time_t) \
+		    (0 < (time_t) -1 ? (time_t) 0 \
+		     : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1)))
 #endif
 #ifndef TIME_T_MAX
 #define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)