diff --git a/share/CMakeLists.txt b/share/CMakeLists.txt
index 58c575c90..b12eb85ef 100644
--- a/share/CMakeLists.txt
+++ b/share/CMakeLists.txt
@@ -30,7 +30,10 @@ if(APPLE)
 	string(REGEX REPLACE "OPENSSLDIR: \"(.*)\"" "\\1" HTTPS_CA_DIR "${OPENSSL_VERSION}")
 endif()
 
-execute_process(COMMAND ${CMAKE_COMMAND} -DHTTPS_CA_DIR=${HTTPS_CA_DIR} -DWORK_DIR=${CMAKE_CURRENT_SOURCE_DIR} -DOUTPUT_DIR=${CMAKE_CURRENT_BINARY_DIR} -P ${CMAKE_CURRENT_SOURCE_DIR}/rootca.cmake)
+set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/rootca.pem PROPERTIES GENERATED TRUE)
+add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/rootca.pem
+	COMMAND ${CMAKE_COMMAND} -DHTTPS_CA_DIR=${HTTPS_CA_DIR} -DWORK_DIR=${CMAKE_CURRENT_SOURCE_DIR} -DOUTPUT_DIR=${CMAKE_CURRENT_BINARY_DIR} -P ${CMAKE_CURRENT_SOURCE_DIR}/rootca.cmake)
+add_custom_target(rootca ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/rootca.pem)
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/rootca.pem
 	DESTINATION ${PACKAGE_DATA_DIR}/linphone