diff --git a/CMakeLists.txt b/CMakeLists.txt
index c3f6b49b..6b001e94 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -620,7 +620,7 @@ set (hs_exec_SRCS
     src/hwlm/hwlm.c
     src/hwlm/hwlm.h
     src/hwlm/hwlm_internal.h
-    src/hwlm/noodle_engine.c
+    src/hwlm/noodle_engine.cpp
     src/hwlm/noodle_engine.h
     src/hwlm/noodle_internal.h
     src/nfa/accel.c