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diff --git a/hicn-light/src/core/ticks.h b/hicn-light/src/core/ticks.h
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+++ b/hicn-light/src/core/ticks.h
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+/*
+ * Copyright (c) 2017-2019 Cisco and/or its affiliates.
+ * 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.
+ */
+
+/**
+ * @brief The router periodically measures time in units of Ticks
+ *
+ * See forwarder.c HZ which specifies the tick rate.  forwarder.h has functions
+ * to convert between ticks and milliseconds.
+ *
+ */
+#ifndef ticks_h
+#define ticks_h
+
+#define __STDC_FORMAT_MACROS
+#include <stdint.h>
+
+typedef uint64_t Ticks;
+
+#endif  // ticks_h