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diff --git a/libsolidity/formal/SymbolicBoolVariable.h b/libsolidity/formal/SymbolicBoolVariable.h
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+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <libsolidity/formal/SymbolicVariable.h>
+
+#include <libsolidity/ast/Types.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+/**
+ * Specialization of SymbolicVariable for Bool
+ */
+class SymbolicBoolVariable: public SymbolicVariable
+{
+public:
+	SymbolicBoolVariable(
+		Declaration const& _decl,
+		smt::SolverInterface& _interface
+	);
+
+	/// Sets the var to false.
+	void setZeroValue(int _seq);
+	/// Does nothing since the SMT solver already knows the valid values.
+	void setUnknownValue(int _seq);
+};
+
+}
+}