diff --git a/aegisub/src/auto4_lua_dialog.cpp b/aegisub/src/auto4_lua_dialog.cpp
index bf988b95e..b073ff963 100644
--- a/aegisub/src/auto4_lua_dialog.cpp
+++ b/aegisub/src/auto4_lua_dialog.cpp
@@ -291,7 +291,10 @@ namespace Automation4 {
 				}
 
 				bool TransferFromWindow() {
-					*value = static_cast<wxSpinCtrlDouble*>(GetWindow())->GetValue();
+					auto ctrl = static_cast<wxSpinCtrlDouble*>(GetWindow());
+					wxFocusEvent evt;
+					ctrl->OnTextLostFocus(evt);
+					*value = ctrl->GetValue();
 					return true;
 				}
 			};