diff --git a/gas/ChangeLog b/gas/ChangeLog
index 40476234b6c..7ac3677f49c 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,7 @@
+2014-10-15  Chen Gang  <gang.chen.5i5j@gmail.com>
+
+	* config/tc-tic4x.c (md_assemble): Correct strncat size.
+
 2014-10-14  Tristan Gingold  <gingold@adacore.com>
 
 	* NEWS: Add marker for 2.25.
diff --git a/gas/config/tc-tic4x.c b/gas/config/tc-tic4x.c
index 904a68c849e..dc821680739 100644
--- a/gas/config/tc-tic4x.c
+++ b/gas/config/tc-tic4x.c
@@ -2456,7 +2456,7 @@ md_assemble (char *str)
       if (*s)			/* Null terminate for hash_find.  */
 	*s++ = '\0';		/* and skip past null.  */
       strcat (insn->name, "_");
-      strncat (insn->name, str, TIC4X_NAME_MAX - strlen (insn->name));
+      strncat (insn->name, str, TIC4X_NAME_MAX - 1 - strlen (insn->name));
 
       insn->operands[insn->num_operands++].mode = M_PARALLEL;