diff --git a/core/Cargo.toml b/core/Cargo.toml
index 2821f59..00ce060 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -55,7 +55,10 @@ reqwest = { version = "0.12", default-features = false, features = ["json"] }
 getrandom = "0.4.3"
 getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }
 wasm-bindgen-futures = "0.4"
-iroh = { version = "1", optional = true, default-features = false }
+# Browser iroh: default-features off (drops native portmapper/apple-datapath),
+# but keep tls-ring — ring works on wasm and presets::N0 needs it. (Matches n0's
+# own browser-chat example.)
+iroh = { version = "1", optional = true, default-features = false, features = ["tls-ring"] }
 iroh-gossip = { version = "0.101", optional = true, default-features = false, features = ["net"] }
 iroh-blobs = { version = "0.103", optional = true, default-features = false }