diff --git a/src/example/pegtl/CMakeLists.txt b/src/example/pegtl/CMakeLists.txt
index e4efd5695..78e92568c 100644
--- a/src/example/pegtl/CMakeLists.txt
+++ b/src/example/pegtl/CMakeLists.txt
@@ -5,7 +5,6 @@ set(example_sources
   analyze.cpp
   calculator.cpp
   chomsky_hierarchy.cpp
-  cst.cpp
   csv1.cpp
   csv2.cpp
   dispatch.cpp