diff --git a/src/Trigger.cc b/src/Trigger.cc
index 62355357b8..e4ee77975e 100644
--- a/src/Trigger.cc
+++ b/src/Trigger.cc
@@ -98,15 +98,44 @@ protected:
 	double time;
 };
 
-Trigger::Trigger(Expr* arg_cond, Stmt* arg_body,
-                 Stmt* arg_timeout_stmts,
-                 Expr* arg_timeout, Frame* arg_frame,
-                 bool arg_is_return, const Location* arg_location)
+Trigger::Trigger(const Expr* cond, Stmt* body, Stmt* timeout_stmts,
+                 Expr* timeout_expr, Frame* frame,
+                 bool is_return, const Location* location)
+	{
+	timeout_value = -1;
+
+	if ( timeout_expr )
+		{
+		ValPtr timeout_val;
+
+		try
+			{
+			timeout_val = timeout_expr->Eval(frame);
+			}
+		catch ( InterpreterException& )
+			{ /* Already reported */ }
+
+		timeout_value = timeout_val->AsInterval();
+		}
+
+	Init(cond, body, timeout_stmts, frame, is_return, location);
+	}
+
+Trigger::Trigger(const Expr* cond, Stmt* body, Stmt* timeout_stmts,
+                 double timeout, Frame* frame,
+                 bool is_return, const Location* location)
+	{
+	timeout_value = timeout;
+	Init(cond, body, timeout_stmts, frame, is_return, location);
+	}
+
+void Trigger::Init(const Expr* arg_cond, Stmt* arg_body, Stmt* arg_timeout_stmts,
+                   Frame* arg_frame, bool arg_is_return,
+                   const Location* arg_location)
 	{
 	cond = arg_cond;
 	body = arg_body;
 	timeout_stmts = arg_timeout_stmts;
-	timeout = arg_timeout;
 	frame = arg_frame->Clone();
 	timer = nullptr;
 	delayed = false;
@@ -114,7 +143,6 @@ Trigger::Trigger(Expr* arg_cond, Stmt* arg_body,
 	attached = nullptr;
 	is_return = arg_is_return;
 	location = arg_location;
-	timeout_value = -1;
 
 	DBG_LOG(DBG_NOTIFIERS, "%s: instantiating", Name());
 
@@ -132,23 +160,6 @@ Trigger::Trigger(Expr* arg_cond, Stmt* arg_body,
 		arg_frame->SetDelayed();
 		}
 
-	ValPtr timeout_val;
-
-	if ( arg_timeout )
-		{
-		try
-			{
-			timeout_val = arg_timeout->Eval(arg_frame);
-			}
-		catch ( InterpreterException& )
-			{ /* Already reported */ }
-		}
-
-	if ( timeout_val )
-		{
-		timeout_value = timeout_val->AsInterval();
-		}
-
 	// Make sure we don't get deleted if somebody calls a method like
 	// Timeout() while evaluating the trigger.
 	Ref(this);
@@ -198,7 +209,7 @@ Trigger::~Trigger()
 	// point.
 	}
 
-void Trigger::Init(std::vector<ValPtr> index_expr_results)
+void Trigger::ReInit(std::vector<ValPtr> index_expr_results)
 	{
 	assert(! disabled);
 	UnregisterAll();
@@ -276,7 +287,7 @@ bool Trigger::Eval()
 		// Not true. Perhaps next time...
 		DBG_LOG(DBG_NOTIFIERS, "%s: trigger condition is false", Name());
 		Unref(f);
-		Init(std::move(index_expr_results));
+		ReInit(std::move(index_expr_results));
 		return false;
 		}
 
diff --git a/src/Trigger.h b/src/Trigger.h
index 74828ccf13..948eebf1d8 100644
--- a/src/Trigger.h
+++ b/src/Trigger.h
@@ -38,7 +38,9 @@ public:
 	// instantiation.  Note that if the condition is already true, the
 	// statements are executed immediately and the object is deleted
 	// right away.
-	Trigger(Expr* cond, Stmt* body, Stmt* timeout_stmts, Expr* timeout,
+	Trigger(const Expr* cond, Stmt* body, Stmt* timeout_stmts, Expr* timeout,
+		Frame* f, bool is_return, const Location* loc);
+	Trigger(const Expr* cond, Stmt* body, Stmt* timeout_stmts, double timeout,
 		Frame* f, bool is_return, const Location* loc);
 	~Trigger() override;
 
@@ -95,12 +97,16 @@ private:
 	friend class TriggerTraversalCallback;
 	friend class TriggerTimer;
 
-	void Init(std::vector<IntrusivePtr<Val>> index_expr_results);
+	void Init(const Expr* cond, Stmt* body, Stmt* timeout_stmts, Frame* frame,
+	          bool is_return, const Location* location);
+
+	void ReInit(std::vector<IntrusivePtr<Val>> index_expr_results);
+
 	void Register(ID* id);
 	void Register(Val* val);
 	void UnregisterAll();
 
-	Expr* cond;
+	const Expr* cond;
 	Stmt* body;
 	Stmt* timeout_stmts;
 	Expr* timeout;