diff --git a/src/init/init.cpp b/src/init/init.cpp
index c945814e95..4ef0706e25 100644
--- a/src/init/init.cpp
+++ b/src/init/init.cpp
@@ -38,7 +38,6 @@ void initialize() {
     initialize_frontend_lean_module();
     object * w = initialize_init_default(io_mk_world());
     w = initialize_init_lean_default(w);
-    lean::io_mark_end_initialization();
     if (io_result_is_error(w)) {
         io_result_show_error(w);
         dec(w);
@@ -84,6 +83,7 @@ void finalize() {
 
 initializer::initializer() {
     initialize();
+    lean::io_mark_end_initialization();
 }
 
 initializer::~initializer() {
diff --git a/src/runtime/io.cpp b/src/runtime/io.cpp
index 1497447dce..eb4b162b43 100644
--- a/src/runtime/io.cpp
+++ b/src/runtime/io.cpp
@@ -56,7 +56,9 @@ static obj_res option_of_io_result(obj_arg r) {
 }
 
 static bool g_initializing = true;
-void io_mark_end_initialization() { g_initializing = false; }
+void io_mark_end_initialization() {
+    g_initializing = false;
+}
 
 extern "C" obj_res lean_io_initializing(obj_arg r) {
     return set_io_result(r, box(g_initializing));