diff --git a/gas/ChangeLog b/gas/ChangeLog
index 2dc974236ed..c0fb09661ee 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2015-09-05  Chen Gang  <gang.chen.5i5j@gmail.com>
+
+	* config/tc-avr.c (md_section_align): Append UL for -1 to avoid
+	the latest gcc's warning.
+
 2015-08-27  Alan Modra  <amodra@gmail.com>
 
 	PR gas/18581
diff --git a/gas/config/tc-avr.c b/gas/config/tc-avr.c
index c69a91c9857..09eea48f9e7 100644
--- a/gas/config/tc-avr.c
+++ b/gas/config/tc-avr.c
@@ -1230,7 +1230,7 @@ valueT
 md_section_align (asection *seg, valueT addr)
 {
   int align = bfd_get_section_alignment (stdoutput, seg);
-  return ((addr + (1 << align) - 1) & (-1 << align));
+  return ((addr + (1 << align) - 1) & (-1UL << align));
 }
 
 /* If you define this macro, it should return the offset between the