diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27fe87f..b6c5bb4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ set(CMAKE_INSTALL_PREFIX /home/mesasoft/sapp_run)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_CURRENT_SOURCE_DIR}/,,$(abspath $<))\"'")
 
-set (NAT_FORMAT_SRC "src/*.cpp")
+set (NAT_FORMAT_SRC "src/nat_format.cpp")
 
 include_directories(/opt/MESA/include/)
 include_directories(inc)