diff --git a/instsetoo_native/ooenv b/instsetoo_native/ooenv
index f37f6bb7b324..b2bec37c2009 100644
--- a/instsetoo_native/ooenv
+++ b/instsetoo_native/ooenv
@@ -23,6 +23,8 @@ export G_SLICE=always-malloc
 export MALLOC_CHECK_=2
 export MALLOC_PERTURB_=153
 export OOO_DISABLE_RECOVERY=1
+# recommended gtk3 to gtk4 migration 'Enable diagnostic warnings'
+G_ENABLE_DIAGNOSTIC=1
 
 # macOS debugging assistance
 export MallocScribble=1