diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index a9df796..a48b26a 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -149,6 +149,7 @@ add_library(libmarkdown
     "${_ROOT}/setup.c"
     "${_ROOT}/blocktags" "${_ROOT}/tags.c"
     "${_ROOT}/html5.c"
+    "${_ROOT}/v2compat.c"
     "${_ROOT}/flags.c")
 
 set_target_properties(libmarkdown PROPERTIES