diff --git a/src/pyexpression/CMakeLists.txt b/src/pyexpression/CMakeLists.txt
index 0c9714bb..1f49b0b9 100644
--- a/src/pyexpression/CMakeLists.txt
+++ b/src/pyexpression/CMakeLists.txt
@@ -5,5 +5,6 @@ set(SELF_SRCS pyexpression.cpp)
 
 xo_pybind11_library(${SELF_LIB} ${PROJECT_NAME}Targets ${SELF_SRCS})
 xo_pybind11_dependency(${SELF_LIB} xo_expression)
-#xo_pybind11_dependency(${SELF_LIB} xo_pyreflect)
+# always use this when xo_pyfoo depends on xo_pybar
+xo_pybind11_header_dependency(${SELF_LIB} xo_pyreflect)
 xo_dependency(${SELF_LIB} refcnt)