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diff --git a/source/fuzz/counter_overflow_id_source.h b/source/fuzz/counter_overflow_id_source.h
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+// Copyright (c) 2020 Google LLC
+//
+// 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 SOURCE_FUZZ_COUNTER_OVERFLOW_ID_SOURCE_H_
+#define SOURCE_FUZZ_COUNTER_OVERFLOW_ID_SOURCE_H_
+
+#include "source/fuzz/overflow_id_source.h"
+
+namespace spvtools {
+namespace fuzz {
+
+// A source of overflow ids that uses a counter to provide successive ids from
+// a given starting value.
+class CounterOverflowIdSource : public OverflowIdSource {
+ public:
+  // |first_available_id| is the starting value for the counter.
+  explicit CounterOverflowIdSource(uint32_t first_available_id);
+
+  // Always returns true.
+  bool HasOverflowIds() const override;
+
+  // Returns the current counter value and increments the counter.
+  // TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/2541) We should
+  //  account for the case where the maximum allowed id is reached.
+  uint32_t GetNextOverflowId() override;
+
+ private:
+  uint32_t next_available_id_;
+};
+
+}  // namespace fuzz
+}  // namespace spvtools
+
+#endif  // SOURCE_FUZZ_OVERFLOW_ID_SOURCE_COUNTER_H_