diff --git a/modules/externalinflow/CMakeLists.txt b/modules/externalinflow/CMakeLists.txt
index 6c730023a1..6a0b536b4e 100644
--- a/modules/externalinflow/CMakeLists.txt
+++ b/modules/externalinflow/CMakeLists.txt
@@ -30,7 +30,7 @@ target_link_libraries(extinflowlib openfast_prelib)
 target_include_directories(extinflowlib PUBLIC 
   $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>  
 )
-set_target_properties(extinflowlib PROPERTIES PUBLIC_HEADER src/ExternalInflow_Types.h)
+set_target_properties(extinflowlib PROPERTIES PUBLIC_HEADER "src/ExternalInflow_Types.h;src/ExtLoadsDX_Types.h")
 
 install(TARGETS extinflowtypeslib extinflowlib
   EXPORT "${CMAKE_PROJECT_NAME}Libraries"