diff --git a/src/compiler/abepi.rs b/src/compiler/abepi.rs
index caa11804..b58685ae 100644
--- a/src/compiler/abepi.rs
+++ b/src/compiler/abepi.rs
@@ -65,8 +65,8 @@ impl<F: From<u64> + TryInto<u32> + Clone + Debug, V: Clone + Debug> CompilationU
             Statement::Transition(dsym, id, stmt) => {
                 self.compiler_statement_transition(dsym, id, *stmt)
             }
-            Statement::HyperTransition(dsym, ids, machine, exprs, state) => {
-                self.compiler_statement_hyper_transition(dsym, ids, machine, exprs, state)
+            Statement::HyperTransition(dsym, state, call) => {
+                self.compiler_statement_hyper_transition(dsym, state, *call)
             }
             _ => vec![],
         }
@@ -427,10 +427,8 @@ impl<F: From<u64> + TryInto<u32> + Clone + Debug, V: Clone + Debug> CompilationU
     fn compiler_statement_hyper_transition(
         &self,
         _dsym: DebugSymRef,
-        _ids: Vec<V>,
-        _machine: V,
-        _exprs: Vec<Expression<F, V>>,
         _state: V,
+        _call: Statement<F, V>,
     ) -> Vec<CompilationResult<F, V>> {
         todo!("Compile expressions?")
     }
diff --git a/src/compiler/compiler.rs b/src/compiler/compiler.rs
index 27ee0b39..ba6f965f 100644
--- a/src/compiler/compiler.rs
+++ b/src/compiler/compiler.rs
@@ -818,27 +818,23 @@ mod test {
 
         assert!(result.is_ok());
 
-        // Wrong transition operator
         let circuit = "
         machine caller (signal n) (signal b: field) {
-            a', b, c' <== fibo(d, e, f + g) --> final;
+            -> final {
+                a', b, c' <== fibo(d, e, f + g);
+            }
         }
         ";
 
         let debug_sym_ref_factory = DebugSymRefFactory::new("", circuit);
         let result = TLDeclsParser::new().parse(&debug_sym_ref_factory, circuit);
 
-        assert!(result.is_err());
-        let err = result.err().unwrap();
-        assert_eq!(
-            err.to_string(),
-            "Unrecognized token `-` found at 99:100\nExpected one of \"->\""
-        );
+        assert!(result.is_ok());
 
-        // No transition
+        // Wrong transition operator
         let circuit = "
         machine caller (signal n) (signal b: field) {
-            a', b, c' <== fibo(d, e, f + g);
+            a', b, c' <== fibo(d, e, f + g) --> final;
         }
         ";
 
@@ -849,7 +845,7 @@ mod test {
         let err = result.err().unwrap();
         assert_eq!(
             err.to_string(),
-            "Unrecognized token `;` found at 98:99\nExpected one of \"->\""
+            "Unrecognized token `-` found at 99:100\nExpected one of \"->\" or \";\""
         );
     }
 }
diff --git a/src/compiler/semantic/analyser.rs b/src/compiler/semantic/analyser.rs
index 1314b89e..28011d1a 100644
--- a/src/compiler/semantic/analyser.rs
+++ b/src/compiler/semantic/analyser.rs
@@ -272,12 +272,16 @@ impl Analyser {
 
             Statement::SignalDecl(_, _) => {}
             Statement::WGVarDecl(_, _) => {}
-            Statement::HyperTransition(_, ids, _machine, exprs, _state) => {
-                // TODO analyze machine? analyze state?
+            Statement::HyperTransition(_, state, call) => {
+                self.analyse_statement(*call);
+                self.collect_id_usages(&[state]);
+            }
+            Statement::Call(_, ids, _machine, exprs) => {
+                // TODO analyze machine?
+                self.collect_id_usages(&ids);
                 exprs
                     .into_iter()
-                    .for_each(|expr| self.analyse_expression(expr));
-                self.collect_id_usages(&ids);
+                    .for_each(|expr| self.analyse_expression(expr))
             }
         }
     }
diff --git a/src/compiler/setup_inter.rs b/src/compiler/setup_inter.rs
index 8434bae9..2b2d4f18 100644
--- a/src/compiler/setup_inter.rs
+++ b/src/compiler/setup_inter.rs
@@ -250,7 +250,8 @@ impl SetupInterpreter {
 
             SignalAssignment(_, _, _) | WGAssignment(_, _, _) => vec![],
             SignalDecl(_, _) | WGVarDecl(_, _) => vec![],
-            HyperTransition(_, _, _, _, _) => todo!(),
+            Call(_, _, _, _) => todo!(),
+            HyperTransition(_, _, _) => todo!(),
         };
 
         self.add_poly_constraints(result.into_iter().map(|cr| cr.anti_booly).collect());
diff --git a/src/interpreter/mod.rs b/src/interpreter/mod.rs
index 6c98822e..8dfd421d 100644
--- a/src/interpreter/mod.rs
+++ b/src/interpreter/mod.rs
@@ -206,7 +206,8 @@ impl<'a, F: Field + Hash> Interpreter<'a, F> {
             Block(_, stmts) => self.exec_step_block(stmts),
             Assert(_, _) => Ok(None),
             StateDecl(_, _, _) => Ok(None),
-            HyperTransition(_, _, _, _, _) => Ok(None), // TODO execute transition?
+            Call(_, _, _, _) => todo!("execute call?"),
+            HyperTransition(_, _, _) => todo!("execute hypertransition?"),
         }
     }
 
diff --git a/src/parser/ast/statement.rs b/src/parser/ast/statement.rs
index a297c090..82398485 100644
--- a/src/parser/ast/statement.rs
+++ b/src/parser/ast/statement.rs
@@ -35,15 +35,20 @@ pub enum Statement<F, V> {
     Transition(DebugSymRef, V, Box<Statement<F, V>>), // -> x { y }
 
     Block(DebugSymRef, Vec<Statement<F, V>>), // { x }
-    /// Call into another machine with assertion and subsequent transition to another
-    /// state.
+    /// Call into another machine with assertion.
     /// Tuple values:
     /// - debug symbol reference;
     /// - assigned/asserted ids vector;
     /// - machine ID;
-    /// - call argument expressions vector;
+    /// - call argument expressions vector.
+    Call(DebugSymRef, Vec<V>, V, Vec<Expression<F, V>>),
+    /// Call into another machine with assertion and subsequent transition to another
+    /// state.
+    /// Tuple values:
+    /// - debug symbol reference;
     /// - next state ID.
-    HyperTransition(DebugSymRef, Vec<V>, V, Vec<Expression<F, V>>, V),
+    /// - machine call;
+    HyperTransition(DebugSymRef, V, Box<Statement<F, V>>),
 }
 
 impl<F: Debug> Debug for Statement<F, Identifier> {
@@ -93,15 +98,11 @@ impl<F: Debug> Debug for Statement<F, Identifier> {
                         .join(" ")
                 )
             }
-            Statement::HyperTransition(_, ids, machine, exprs, state) => {
-                write!(
-                    f,
-                    "{:?} <== {} ({:?}) --> {:?};",
-                    ids,
-                    machine.name(),
-                    exprs,
-                    state
-                )
+            Statement::Call(_, ids, machine, exprs) => {
+                write!(f, "{:?} <== {} ({:?});", ids, machine.name(), exprs)
+            }
+            Statement::HyperTransition(_, state, call) => {
+                write!(f, "{:?} -> {:?};", call, state)
             }
         }
     }
@@ -121,7 +122,8 @@ impl<F, V> Statement<F, V> {
             Statement::StateDecl(dsym, _, _) => dsym.clone(),
             Statement::Transition(dsym, _, _) => dsym.clone(),
             Statement::Block(dsym, _) => dsym.clone(),
-            Statement::HyperTransition(dsym, _, _, _, _) => dsym.clone(),
+            Statement::Call(dsym, _, _, _) => dsym.clone(),
+            Statement::HyperTransition(dsym, _, _) => dsym.clone(),
         }
     }
 }
diff --git a/src/parser/build.rs b/src/parser/build.rs
index 03348fd8..3fea23b1 100644
--- a/src/parser/build.rs
+++ b/src/parser/build.rs
@@ -61,3 +61,11 @@ pub fn build_transition<F>(
 ) -> Statement<F, Identifier> {
     Statement::Transition(dsym, id, Box::new(block))
 }
+
+pub fn build_hyper_transition<F>(
+    dsym: DebugSymRef,
+    state: Identifier,
+    call: Statement<F, Identifier>,
+) -> Statement<F, Identifier> {
+    Statement::HyperTransition(dsym, state, Box::new(call))
+}
diff --git a/src/parser/chiquito.lalrpop b/src/parser/chiquito.lalrpop
index 35c2d04a..d1ee42f2 100644
--- a/src/parser/chiquito.lalrpop
+++ b/src/parser/chiquito.lalrpop
@@ -53,7 +53,8 @@ StatementType: Statement<BigInt, Identifier> = {
     ParseWGVarDecl,
     ParseTransitionSimple,
     ParseTransition,
-    HyperTransition
+    HyperTransition,
+    Call,
 }
 
 AssertEq: Statement<BigInt, Identifier> = {
@@ -113,7 +114,11 @@ ParseTransition: Statement<BigInt, Identifier> = {
 }
 
 HyperTransition: Statement<BigInt, Identifier> = {
-    <l: @L> <ids: ParseIdsList> "<==" <machine: Identifier> "(" <es:ParseExpressionList> ")" "->" <st: Identifier> <r: @R> => Statement::HyperTransition(dsym_factory.create(l,r), ids, machine, es, st),
+    <l: @L> <call: Call> "->" <st: Identifier> <r: @R> => build_hyper_transition(dsym_factory.create(l,r), st, call),
+}
+
+Call: Statement<BigInt, Identifier> = {
+    <l: @L>  <ids: ParseIdsList> "<==" <machine: Identifier> "(" <es:ParseExpressionList> ")"  <r: @R> => Statement::Call(dsym_factory.create(l,r), ids, machine, es),
 }
 
 ParseSignalDecl: Statement<BigInt, Identifier> = {