diff --git a/internal/services/gateway/api/run.go b/internal/services/gateway/api/run.go
index 0d7e307f..6b132fbe 100644
--- a/internal/services/gateway/api/run.go
+++ b/internal/services/gateway/api/run.go
@@ -620,6 +620,7 @@ func (h *LogsHandler) do(w http.ResponseWriter, r *http.Request) error {
 	// header also if there're currently no lines to send
 	w.Header().Set("Cache-Control", "no-cache")
 	w.Header().Set("Connection", "keep-alive")
+	w.Header().Set("Content-Type", "text/plain;charset=UTF-8")
 	w.WriteHeader(http.StatusOK)
 	var flusher http.Flusher
 	if fl, ok := w.(http.Flusher); ok {
diff --git a/internal/services/runservice/api/api.go b/internal/services/runservice/api/api.go
index 1b3e3e97..701fe090 100644
--- a/internal/services/runservice/api/api.go
+++ b/internal/services/runservice/api/api.go
@@ -255,6 +255,7 @@ func (h *LogsHandler) readTaskLogs(ctx context.Context, runID, taskID string, se
 	// header also if there're currently no lines to send
 	w.Header().Set("Cache-Control", "no-cache")
 	w.Header().Set("Connection", "keep-alive")
+	w.Header().Set("Content-Type", "text/plain;charset=UTF-8")
 	w.WriteHeader(http.StatusOK)
 	var flusher http.Flusher
 	if fl, ok := w.(http.Flusher); ok {