diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
index ad5df4c81..ebe433dae 100644
--- a/src/journal/journald-stream.c
+++ b/src/journal/journald-stream.c
@@ -339,6 +339,7 @@ void stdout_stream_free(StdoutStream *s) {
 #endif
 
         free(s->identifier);
+        free(s->unit_id);
         free(s);
 }