diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -407,6 +407,7 @@ add_files(
     string.cpp
     string_base.h
     string_func.h
+    string_func_extra.h
     string_type.h
     stringfilter.cpp
     stringfilter_type.h