diff --git a/src/lib/world_magnetic_model/CMakeLists.txt b/src/lib/world_magnetic_model/CMakeLists.txt
index 6ce38c6dd9..853a1217e2 100644
--- a/src/lib/world_magnetic_model/CMakeLists.txt
+++ b/src/lib/world_magnetic_model/CMakeLists.txt
@@ -34,7 +34,6 @@
 add_custom_target(world_magnetic_model_update
 	COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/fetch_noaa_table.py > ${CMAKE_CURRENT_SOURCE_DIR}/geo_magnetic_tables.hpp
 	DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/fetch_noaa_table.py
-	BYPRODUCTS ${CMAKE_CURRENT_SOURCE_DIR}/geo_magnetic_tables.hpp
 	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 	USES_TERMINAL
 	COMMENT "Updating world magnetic model from NOAA (${CMAKE_CURRENT_SOURCE_DIR}/geo_magnetic_tables.hpp)"
@@ -43,7 +42,6 @@ add_custom_target(world_magnetic_model_update
 add_custom_target(world_magnetic_model_tests_update
 	COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/generate_gtest.py > ${CMAKE_CURRENT_SOURCE_DIR}/test_geo_lookup.cpp
 	DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/generate_gtest.py
-	BYPRODUCTS ${CMAKE_CURRENT_SOURCE_DIR}/test_geo_lookup.cpp
 	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 	USES_TERMINAL
 	COMMENT "Updating world magnetic model unit tests from NOAA (${CMAKE_CURRENT_SOURCE_DIR}/test_geo_lookup.cpp)"