diff --git a/hugr-core/Cargo.toml b/hugr-core/Cargo.toml
index ce779787d..84b83677f 100644
--- a/hugr-core/Cargo.toml
+++ b/hugr-core/Cargo.toml
@@ -20,7 +20,6 @@ workspace = true
 extension_inference = []
 declarative = ["serde_yaml"]
 model_unstable = ["hugr-model"]
-default = ["model_unstable"]
 
 [lib]
 bench = false