diff --git a/src/basic/memstream-util.c b/src/basic/memstream-util.c
index 4e147fd78f..3becc8520e 100644
--- a/src/basic/memstream-util.c
+++ b/src/basic/memstream-util.c
@@ -69,7 +69,7 @@ int memstream_dump_internal(
 
         r = memstream_finalize(m, &buf, NULL);
         if (r < 0)
-                return log_full_errno(level, r, "Failed to flush memstream: %m: %m");
+                return log_full_errno(level, r, "Failed to flush memstream: %m");
 
         return log_dump_internal(level, error, file, line, func, buf);
 }