diff --git a/strawberry/http/base.py b/strawberry/http/base.py
index 2478c55574..b69766ec58 100644
--- a/strawberry/http/base.py
+++ b/strawberry/http/base.py
@@ -86,4 +86,4 @@ def _is_multipart_subscriptions(
         if params.get("boundary") != "graphql":
             return False
 
-        return params.get("subscriptionspec") == "1.0"
+        return params.get("subscriptionspec", "").startswith("1.0")