diff --git a/src/winio.c b/src/winio.c
index 639bc9b..24e4795 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -1905,7 +1905,7 @@ char *display_string(const char *buf, size_t start_col, size_t span,
     converted[index] = '\0';
 
     /* Make sure converted takes up no more than span columns. */
-    index = actual_x(converted, span - margin);
+    index = actual_x(converted, span);
     null_at(&converted, index);
 
     return converted;