diff --git a/src/gfx.cpp b/src/gfx.cpp
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -403,7 +403,7 @@ static int DrawString(int left, int righ
 	int initial_right = right;
 	int initial_top = top;
 
-	if (truncate) TruncateString(str, right - left);
+	if (truncate) TruncateString(str, right - left + 1);
 
 	/*
 	 * To support SETX and SETXY properly with RTL languages we have to