diff --git a/main/main.cpp b/main/main.cpp
index b9cb755cbff0..69c5af25caa7 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -3175,10 +3175,12 @@ bool Main::iteration() {
 		auto_build_solutions = false;
 		// Only relevant when running the editor.
 		if (!editor) {
+			OS::get_singleton()->set_exit_code(EXIT_FAILURE);
 			ERR_FAIL_V_MSG(true,
 					"Command line option --build-solutions was passed, but no project is being edited. Aborting.");
 		}
 		if (!EditorNode::get_singleton()->call_build()) {
+			OS::get_singleton()->set_exit_code(EXIT_FAILURE);
 			ERR_FAIL_V_MSG(true,
 					"Command line option --build-solutions was passed, but the build callback failed. Aborting.");
 		}