diff --git a/KSPCommunityFixes/QoL/AltimeterHorizontalPosition.cs b/KSPCommunityFixes/QoL/AltimeterHorizontalPosition.cs
index 313ab42..d288d68 100644
--- a/KSPCommunityFixes/QoL/AltimeterHorizontalPosition.cs
+++ b/KSPCommunityFixes/QoL/AltimeterHorizontalPosition.cs
@@ -119,6 +119,12 @@ static void MapView_enterMapView_Prefix()
             if (trackingFiltersHoverArea != null)
             {
                 trackingFiltersHoverArea.SetActive(true);
+
+                // Fix issue #39
+                // updateButtonsToFilter is checking for the isActiveAndEnabled state of button GO before setting state.
+                // Since we disabled the containing GO when this was called in MapViewFiltering.Init(), the buttons state  
+                // will be incorrect initially, so update them manually.
+                MapViewFiltering.Instance.updateButtonsToFilter(MapViewFiltering.vesselTypeFilter);
             }
         }