1 files changed, 3 insertions, 1 deletions
diff --git a/time.c b/time.c
index 00061f78ff..97eeb6a365 100644
--- a/time.c
+++ b/time.c
@@ -18,6 +18,7 @@
 #include <unistd.h>
 #endif
 
+#include <errno.h>
 #include <math.h>
 
 VALUE rb_cTime;
@@ -1776,8 +1777,9 @@ rb_strftime(buf, format, time)
     if (flen == 0) {
 	return 0;
     }
+    errno = 0;
     len = strftime(*buf, SMALLBUF, format, time);
-    if (len != 0 || **buf == '\0') return len;
+    if (len != 0 || (**buf == '\0' && errno != ERANGE)) return len;
     for (size=1024; ; size*=2) {
 	*buf = xmalloc(size);
 	(*buf)[0] = '\0';