diff --git a/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp b/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp
index 24136a6b4..4faf71964 100644
--- a/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp
+++ b/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp
@@ -4033,6 +4033,7 @@ intptr_t CALLBACK AutoCompletionSubDlg::run_dlgProc(UINT message, WPARAM wParam,
 			{
 				::EnableWindow(::GetDlgItem(_hSelf, IDD_AUTOC_FUNCRADIO), FALSE);
 				::EnableWindow(::GetDlgItem(_hSelf, IDD_AUTOC_WORDRADIO), FALSE);
+				::EnableWindow(::GetDlgItem(_hSelf, IDD_AUTOC_BRIEF_CHECK), FALSE);
 				::EnableWindow(::GetDlgItem(_hSelf, IDD_AUTOC_BOTHRADIO), FALSE);
 				::EnableWindow(::GetDlgItem(_hSelf, IDD_AUTOC_USEENTER), FALSE);
 				::EnableWindow(::GetDlgItem(_hSelf, IDD_AUTOC_USETAB), FALSE);