diff --git a/src/mac/carbon/combobox.cpp b/src/mac/carbon/combobox.cpp
index 35de671962..f1a1aef0b3 100644
--- a/src/mac/carbon/combobox.cpp
+++ b/src/mac/carbon/combobox.cpp
@@ -155,7 +155,7 @@ protected:
     void OnFocus( wxFocusEvent& event )
     {
         // Unfortunately the fix below completely disables the combobox on Mac OS 10.4 (and presumably below)
-        if (UMAGetSystemVersion() <= 0x1040)
+        if (UMAGetSystemVersion() < 0x1050)
         {
             event.Skip();
             return;