diff --git a/plugins/out_http/http.c b/plugins/out_http/http.c
index d804b7734f6..17840975309 100644
--- a/plugins/out_http/http.c
+++ b/plugins/out_http/http.c
@@ -178,7 +178,6 @@ static int http_post(struct flb_out_http *ctx,
     }
     else if ((ctx->out_format == FLB_PACK_JSON_FORMAT_JSON) ||
         (ctx->out_format == FLB_PACK_JSON_FORMAT_STREAM) ||
-        (ctx->out_format == FLB_PACK_JSON_FORMAT_LINES) ||
         (ctx->out_format == FLB_HTTP_OUT_GELF)) {
         flb_http_add_header(c,
                             FLB_HTTP_CONTENT_TYPE,
@@ -186,6 +185,13 @@ static int http_post(struct flb_out_http *ctx,
                             FLB_HTTP_MIME_JSON,
                             sizeof(FLB_HTTP_MIME_JSON) - 1);
     }
+    else if ((ctx->out_format == FLB_PACK_JSON_FORMAT_LINES)) {
+        flb_http_add_header(c,
+                            FLB_HTTP_CONTENT_TYPE,
+                            sizeof(FLB_HTTP_CONTENT_TYPE) - 1,
+                            FLB_HTTP_MIME_NDJSON,
+                            sizeof(FLB_HTTP_MIME_NDJSON) - 1);
+    }
     else if ((ctx->out_format == FLB_HTTP_OUT_MSGPACK)) {
         flb_http_add_header(c,
                             FLB_HTTP_CONTENT_TYPE,
diff --git a/plugins/out_http/http.h b/plugins/out_http/http.h
index 585e51cb40f..ba588ac90ca 100644
--- a/plugins/out_http/http.h
+++ b/plugins/out_http/http.h
@@ -26,6 +26,7 @@
 #define FLB_HTTP_CONTENT_TYPE   "Content-Type"
 #define FLB_HTTP_MIME_MSGPACK   "application/msgpack"
 #define FLB_HTTP_MIME_JSON      "application/json"
+#define FLB_HTTP_MIME_NDJSON    "application/x-ndjson"
 
 #ifdef FLB_HAVE_SIGNV4
 #ifdef FLB_HAVE_AWS