diff --git a/src/System.Windows.Forms/System/Windows/Forms/Controls/ListBoxes/CheckedListBox.cs b/src/System.Windows.Forms/System/Windows/Forms/Controls/ListBoxes/CheckedListBox.cs
index 43fc2822fac..8771c0c87c2 100644
--- a/src/System.Windows.Forms/System/Windows/Forms/Controls/ListBoxes/CheckedListBox.cs
+++ b/src/System.Windows.Forms/System/Windows/Forms/Controls/ListBoxes/CheckedListBox.cs
@@ -934,6 +934,10 @@ protected override void WndProc(ref Message m)
     {
         switch (m.MsgInternal)
         {
+            case PInvokeCore.WM_CHAR when (char)(uint)m.WParamInternal == ' ':
+                LbnSelChange();
+                m.ResultInternal = (LRESULT)0;
+                break;
             case MessageId.WM_REFLECT_CHARTOITEM:
                 m.ResultInternal = (LRESULT)(-1);
                 break;