diff --git a/dtool/src/dtoolutil/CMakeLists.txt b/dtool/src/dtoolutil/CMakeLists.txt
index 9ee7961987..eab710f3fb 100644
--- a/dtool/src/dtoolutil/CMakeLists.txt
+++ b/dtool/src/dtoolutil/CMakeLists.txt
@@ -60,6 +60,8 @@ set(P3DTOOLUTIL_IGATEEXT
   filename_ext.h
   globPattern_ext.cxx
   globPattern_ext.h
+  textEncoder_ext.cxx
+  textEncoder_ext.h
 )
 
 composite_sources(p3dtoolutil P3DTOOLUTIL_SOURCES)