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-rw-r--r--gpsd_json.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/gpsd_json.c b/gpsd_json.c
index 9837efb3..7879f180 100644
--- a/gpsd_json.c
+++ b/gpsd_json.c
@@ -489,7 +489,7 @@ void subframe_json_dump(const struct subframe_t *subframe, /*@out@*/ char buf[],
* control charactores (U+0000 through U+001F).must be
* escaped. That escaping not done yet */
(void)snprintf(buf + len, buflen - len,
- ",\"system_message\":%.50s",
+ ",\"system_message\":\"%.50s\"",
subframe->sub4_17.str);
break;
case 56: