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-rw-r--r--lib/mqtt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mqtt.c b/lib/mqtt.c
index d09aab4ee..c8f011a14 100644
--- a/lib/mqtt.c
+++ b/lib/mqtt.c
@@ -319,7 +319,7 @@ static CURLcode mqtt_publish(struct connectdata *conn)
{
CURLcode result;
char *payload = conn->data->set.postfields;
- size_t payloadlen = (size_t)conn->data->set.postfieldsize;
+ size_t payloadlen = (size_t)conn->data->set.filesize;
char *topic = NULL;
size_t topiclen;
unsigned char *pkt = NULL;