diff --git a/Display.h b/Display.h
index 9e06985..abd2cfb 100644
--- a/Display.h
+++ b/Display.h
@@ -41,7 +41,7 @@ private:
     //std::list<Line> m_lines;
     //Line *m_curLine = nullptr; // get any value if the underlying vector gets resized and moved in memory
     Line m_curLine;              // -> either make a copy
-    size_t m_curLineIdx = -1;    //    or just use index
+    int m_curLineIdx = -1;       //    or just use index
 
     unsigned int m_step = 0;
     void update();