diff --git a/src/circuit_json.rs b/src/circuit_json.rs
index fba9889..35b48fb 100644
--- a/src/circuit_json.rs
+++ b/src/circuit_json.rs
@@ -138,7 +138,7 @@ pub enum Classical {
 }
 
 /// Serializable operation descriptor.
-#[derive(Deserialize, Serialize, Clone, Debug, Default, PartialEq)]
+#[derive(Deserialize, Serialize, Clone, Debug, PartialEq)]
 #[non_exhaustive]
 pub struct Operation<P = String> {
     /// The type of operation.
@@ -202,14 +202,10 @@ pub struct SerialCircuit<P = String> {
     pub implicit_permutation: Vec<Permutation>,
 }
 
-impl<P> Operation<P> {
-    /// Returns a default-initialized Operation with the given type.
-    ///
-    /// For optypes that require additional parameters, this may generate
-    /// invalid operations.
-    pub fn from_optype(op_type: OpType) -> Self {
+impl<P> Default for Operation<P> {
+    fn default() -> Self {
         Self {
-            op_type,
+            op_type: Default::default(),
             n_qb: None,
             data: None,
             params: None,
@@ -220,3 +216,16 @@ impl<P> Operation<P> {
         }
     }
 }
+
+impl<P> Operation<P> {
+    /// Returns a default-initialized Operation with the given type.
+    ///
+    /// For optypes that require additional parameters, this may generate
+    /// invalid operations.
+    pub fn from_optype(op_type: OpType) -> Self {
+        Self {
+            op_type,
+            ..Operation::default()
+        }
+    }
+}