diff --git a/include/wx/listbase.h b/include/wx/listbase.h
index bb9098e4b3..df569db9ee 100644
--- a/include/wx/listbase.h
+++ b/include/wx/listbase.h
@@ -447,7 +447,7 @@ public:
     virtual void CheckItem(long WXUNUSED(item), bool WXUNUSED(check)) { }
 
     // Sort indicator in header.
-    virtual void ShowSortIndicator(int WXUNUSED(idx), bool WXUNUSED(ascending) = true) { }
+    virtual void ShowSortIndicator(int WXUNUSED(col), bool WXUNUSED(ascending) = true) { }
     void RemoveSortIndicator() { ShowSortIndicator(-1); }
     virtual int GetSortIndicator() const { return -1; }
     virtual bool IsAscendingSortIndicator() const { return true; }
diff --git a/interface/wx/listctrl.h b/interface/wx/listctrl.h
index c107b4f6b2..a2620d35fe 100644
--- a/interface/wx/listctrl.h
+++ b/interface/wx/listctrl.h
@@ -1432,7 +1432,7 @@ public:
 
         @note This does not actually sort the list, use SortItems() for this.
 
-        @param idx
+        @param col
             The column to set the sort indicator for.
             If @c -1 is given, then the currently shown sort indicator
             will be removed.
@@ -1442,7 +1442,7 @@ public:
 
         @since 3.1.6
     */
-    void ShowSortIndicator(int idx, bool ascending = true);
+    void ShowSortIndicator(int col, bool ascending = true);
 
     /**
         Remove the sort indicator from the column being used as sort key.