diff --git a/src/flt_http_comp.c b/src/flt_http_comp.c
index b04dcd1..37f237f 100644
--- a/src/flt_http_comp.c
+++ b/src/flt_http_comp.c
@@ -523,6 +523,9 @@
 		}
 	}
 
+	if (http_header_add_tail2(msg, &txn->hdr_idx, "Vary: Accept-Encoding", 21) < 0)
+		goto error;
+
 	return 1;
 
   error:
@@ -577,6 +580,9 @@
 		}
 	}
 
+	if (!http_add_header(htx, ist("Vary"), ist("Accept-Encoding")))
+		goto error;
+
 	return 1;
 
   error: