diff --git a/newlib/libc/time/tzcalc_limits.c b/newlib/libc/time/tzcalc_limits.c
index e0ea6549c..00044a5d3 100644
--- a/newlib/libc/time/tzcalc_limits.c
+++ b/newlib/libc/time/tzcalc_limits.c
@@ -66,7 +66,7 @@ __tzcalc_limits (int year)
 	}
 
       /* store the change-over time in GMT form by adding offset */
-      tz->__tzrule[i].change = days * SECSPERDAY +
+      tz->__tzrule[i].change = (time_t) days * SECSPERDAY +
       tz->__tzrule[i].s + tz->__tzrule[i].offset;
     }