diff --git a/src/testzzuf/socat.c b/src/testzzuf/socat.c
index 0d2d5a9e..e4559a02 100644
--- a/src/testzzuf/socat.c
+++ b/src/testzzuf/socat.c
@@ -51,6 +51,7 @@ zzuf_socat_start ()
     "--ratio=0.0:0.75",
     "-n",
     "-A",
+    "--",
     "socat",
     "-lf",
     "/dev/null",