diff --git a/gas/ChangeLog b/gas/ChangeLog
index df4cbfbe0c7..263d0b2871a 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,9 @@
+2016-04-17  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	Revert prevous change.
+	* config/tc-arc.c (arc_option): Make .cpu directive
+	case-sensitive again.
+
 2016-04-16  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* config/tc-arc.c (arc_option): Make .cpu directive
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index 4f4e970400e..169b05c348f 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -878,26 +878,26 @@ arc_option (int ignore ATTRIBUTE_UNUSED)
 
   if (!mach_type_specified_p)
     {
-      if ((!strcasecmp ("ARC600", cpu))
-	  || (!strcasecmp ("ARC601", cpu))
-	  || (!strcasecmp ("A6", cpu)))
+      if ((!strcmp ("ARC600", cpu))
+	  || (!strcmp ("ARC601", cpu))
+	  || (!strcmp ("A6", cpu)))
 	{
 	  md_parse_option (OPTION_MCPU, "arc600");
 	}
-      else if ((!strcasecmp ("ARC700", cpu))
-	       || (!strcasecmp ("A7", cpu)))
+      else if ((!strcmp ("ARC700", cpu))
+	       || (!strcmp ("A7", cpu)))
 	{
 	  md_parse_option (OPTION_MCPU, "arc700");
 	}
-      else if (!strcasecmp ("EM", cpu))
+      else if (!strcmp ("EM", cpu))
 	{
 	  md_parse_option (OPTION_MCPU, "arcem");
 	}
-      else if (!strcasecmp ("HS", cpu))
+      else if (!strcmp ("HS", cpu))
 	{
 	  md_parse_option (OPTION_MCPU, "archs");
 	}
-      else if (!strcasecmp ("NPS400", cpu))
+      else if (!strcmp ("NPS400", cpu))
 	{
 	  md_parse_option (OPTION_MCPU, "nps400");
 	}