diff --git a/c2hal/Define.h b/c2hal/Define.h
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index 0000000..e66159d
--- /dev/null
+++ b/c2hal/Define.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef DEFINE_H_
+#define DEFINE_H_
+
+#include <android-base/macros.h>
+#include <android-base/logging.h>
+#include <string>
+#include <vector>
+#include "Declaration.h"
+#include "Expression.h"
+
+namespace android {
+
+struct Define : Declaration {
+    Define(const std::string &name, const std::string &slurp);
+    ~Define();
+
+    static std::string type() { return "define"; }
+    const std::string decType() const override { return type(); }
+
+    void generateSource(Formatter &out) const override;
+    void processContents(AST &ast) override;
+
+    Expression::Type getExpressionType() const;
+    Expression *getExpression() const;
+    void setExpression(Expression* expression);
+
+private:
+    const std::string mSlurp;
+
+    Expression::Type mExpressionType;
+    Expression* mExpression = NULL;
+
+    DISALLOW_COPY_AND_ASSIGN(Define);
+};
+
+}  // namespace android
+
+#endif  // DEFINE_H_
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