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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 b5693c38..8fd0edef 100644
--- a/gpsd_json.c
+++ b/gpsd_json.c
@@ -2211,7 +2211,7 @@ void json_aivdm_dump(const struct ais_t *ais,
ais->type8.dac1fid11.visibility);
if (!scaled)
(void)snprintf(buf + strlen(buf), buflen - strlen(buf),
- "\"waterlevel\":%u,",
+ "\"waterlevel\":%d,",
ais->type8.dac1fid11.waterlevel);
else
(void)snprintf(buf + strlen(buf), buflen - strlen(buf),