diff --git a/include/wx/stc/stc.h b/include/wx/stc/stc.h
index f71fe5f772..1edf28158e 100644
--- a/include/wx/stc/stc.h
+++ b/include/wx/stc/stc.h
@@ -4628,7 +4628,7 @@ public:
     // implement wxTextAreaBase pure virtual methods
     // ---------------------------------------------
 
-    virtual int GetLineLength(long n) const { return GetLine(n).length(); }
+    virtual int GetLineLength(long lineNo) const { return static_cast<int>(GetLineText(lineNo).length()); }
     virtual wxString GetLineText(long lineNo) const
     {
         wxString text = GetLine(static_cast<int>(lineNo));
diff --git a/src/stc/stc.h.in b/src/stc/stc.h.in
index e4b3a05406..1c980ab3cc 100644
--- a/src/stc/stc.h.in
+++ b/src/stc/stc.h.in
@@ -370,7 +370,7 @@ public:
     // implement wxTextAreaBase pure virtual methods
     // ---------------------------------------------
 
-    virtual int GetLineLength(long n) const { return GetLine(n).length(); }
+    virtual int GetLineLength(long lineNo) const { return static_cast<int>(GetLineText(lineNo).length()); }
     virtual wxString GetLineText(long lineNo) const
     {
         wxString text = GetLine(static_cast<int>(lineNo));