diff --git a/external/glib/cppgir b/external/glib/cppgir
index 69ef481..b617fa6 160000
--- a/external/glib/cppgir
+++ b/external/glib/cppgir
@@ -1 +1 @@
-Subproject commit 69ef481cba38e848554cc5403b8d4141d3c51335
+Subproject commit b617fa6131e07594d22ce6ac95892c2e08e4863c
diff --git a/external/glib/generate_cppgir.cmake b/external/glib/generate_cppgir.cmake
index e1cca4f..c15d3f9 100644
--- a/external/glib/generate_cppgir.cmake
+++ b/external/glib/generate_cppgir.cmake
@@ -33,7 +33,6 @@ function(generate_cppgir target_name gir)
         --class
         --class-full
         --expected
-        --optional
         --ignore
         "$<JOIN:${ignore_files},:>"
         --output