diff --git a/src/ast/fallthrough_statement.cc b/src/ast/fallthrough_statement.cc
new file mode 100644
index 0000000..f5ddcea
--- /dev/null
+++ b/src/ast/fallthrough_statement.cc
@@ -0,0 +1,37 @@
+// Copyright 2020 The Tint Authors.
+//
+// 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.
+
+#include "src/ast/fallthrough_statement.h"
+
+namespace tint {
+namespace ast {
+
+FallthroughStatement::FallthroughStatement() : Statement() {}
+
+FallthroughStatement::FallthroughStatement(const Source& source)
+    : Statement(source) {}
+
+FallthroughStatement::~FallthroughStatement() = default;
+
+bool FallthroughStatement::IsValid() const {
+  return true;
+}
+
+void FallthroughStatement::to_str(std::ostream& out, size_t indent) const {
+  make_indent(out, indent);
+  out << "Fallthrough" << std::endl;
+}
+
+}  // namespace ast
+}  // namespace tint