diff --git a/platforms/posix/cmake/sitl_target.cmake b/platforms/posix/cmake/sitl_target.cmake
index e68a9359d8..937a43ae9c 100644
--- a/platforms/posix/cmake/sitl_target.cmake
+++ b/platforms/posix/cmake/sitl_target.cmake
@@ -44,6 +44,7 @@ ExternalProject_Add(sitl_gazebo
 	USES_TERMINAL_BUILD true
 	EXCLUDE_FROM_ALL true
 	BUILD_ALWAYS 1
+	BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> -- -j2
 )
 
 ExternalProject_Add(mavsdk_tests