diff --git a/gas/ChangeLog b/gas/ChangeLog
index 9ee06673ba..d335c919f3 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2013-08-21  Alan Modra  <amodra@gmail.com>
+
+	* symbols.c (fb_label_instance_inc, fb_label_instance): Properly
+	range check label number for use with fb_low_counter array.
+
 2013-08-19  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* config/tc-mips.c (mips_check_isa_supports_ase, reg_lookup)
diff --git a/gas/symbols.c b/gas/symbols.c
index 05ae6a71e1..67fc84bb7e 100644
--- a/gas/symbols.c
+++ b/gas/symbols.c
@@ -1749,7 +1749,7 @@ fb_label_instance_inc (long label)
 {
   long *i;
 
-  if (label < FB_LABEL_SPECIAL)
+  if ((unsigned long) label < FB_LABEL_SPECIAL)
     {
       ++fb_low_counter[label];
       return;
@@ -1797,7 +1797,7 @@ fb_label_instance (long label)
 {
   long *i;
 
-  if (label < FB_LABEL_SPECIAL)
+  if ((unsigned long) label < FB_LABEL_SPECIAL)
     {
       return (fb_low_counter[label]);
     }