diff --git a/ports/gumbo/CMakeLists.txt b/ports/gumbo/CMakeLists.txt
index 9c06b6f984e..fe239cb8a29 100644
--- a/ports/gumbo/CMakeLists.txt
+++ b/ports/gumbo/CMakeLists.txt
@@ -28,5 +28,5 @@ install(
   ARCHIVE DESTINATION lib
 )
 if(NOT DISABLE_INSTALL_HEADERS)
-  install(FILES  src/gumbo.h DESTINATION include)
+  install(FILES  src/gumbo.h src/tag_enum.h DESTINATION include)
 endif()