diff --git a/urjtag/ChangeLog b/urjtag/ChangeLog
index 43d09abe..34f43dc8 100644
--- a/urjtag/ChangeLog
+++ b/urjtag/ChangeLog
@@ -3,6 +3,9 @@
   * src/cmd/cmd_bit.c (cmd_bit_print_params): Fix strncat length handling.
   * src/tap/detect.c (urj_tap_detect_parts): Likewise.
 
+  * src/tap/cable/jlink.c (jlink_debug_buffer): Unify log lines to avoid
+    printf format security warnings.
+
 2010-01-21  Jie Zhang  <jie.zhang@analog.com>
 
   * src/apps/jtag/jtag.c (main): Don't trigger open file error
diff --git a/urjtag/src/tap/cable/jlink.c b/urjtag/src/tap/cable/jlink.c
index fe4460b1..22ac6e73 100644
--- a/urjtag/src/tap/cable/jlink.c
+++ b/urjtag/src/tap/cable/jlink.c
@@ -404,8 +404,7 @@ jlink_debug_buffer (char *buffer, int length)
             snprintf (s, 4, " %02x", buffer[j]);
             strcat (line, s);
         }
-        urj_log (URJ_LOG_LEVEL_DETAIL, line);
-        urj_log (URJ_LOG_LEVEL_DETAIL, "\n");
+        urj_log (URJ_LOG_LEVEL_DETAIL, "%s\n", line);
     }
 }