diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 079be7772d..f3a358e66a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2014-12-13  Doug Evans  <xdje42@gmail.com>
+
+	* utils.c (make_hex_string): Fix off-by-one error.
+
 2014-12-13  Joel Brobecker  <brobecker@adacore.com>
 
 	* ada-lang.h (ada_ensure_varsize_limit): Declare.
diff --git a/gdb/utils.c b/gdb/utils.c
index ea2b18a801..47adb67cb4 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -1124,7 +1124,7 @@ make_hex_string (const gdb_byte *data, size_t length)
 
   p = result;
   for (i = 0; i < length; ++i)
-    p += xsnprintf (p, 2, "%02x", data[i]);
+    p += xsnprintf (p, 3, "%02x", data[i]);
   *p = '\0';
   return result;
 }