diff --git a/cmd/ooniprobe/internal/log/handlers/cli/measurements.go b/cmd/ooniprobe/internal/log/handlers/cli/measurements.go
index 8d74aca..cf1f022 100644
--- a/cmd/ooniprobe/internal/log/handlers/cli/measurements.go
+++ b/cmd/ooniprobe/internal/log/handlers/cli/measurements.go
@@ -137,6 +137,6 @@ func logMeasurementJSON(w io.Writer, f log.Fields) error {
 	if err != nil {
 		return err
 	}
-	fmt.Fprintf(w, string(json))
+	fmt.Fprintf(w, "%s", string(json))
 	return nil
 }