diff --git a/libc/tzcode/asctime.c b/libc/tzcode/asctime.c
index 152b0db4e..fea24e479 100644
--- a/libc/tzcode/asctime.c
+++ b/libc/tzcode/asctime.c
@@ -103,7 +103,7 @@ asctime_r(register const struct tm *timeptr, char *buf)
 	/*
 	** We avoid using snprintf since it's not available on all systems.
 	*/
-	(void) sprintf(result,
+	(void) snprintf(result, sizeof(result), /* Android change: use snprintf. */
 		((strlen(year) <= 4) ? ASCTIME_FMT : ASCTIME_FMT_B),
 		wn, mn,
 		timeptr->tm_mday, timeptr->tm_hour,