diff --git a/render.c b/render.c
index 9149dc2c..9218527e 100644
--- a/render.c
+++ b/render.c
@@ -1031,7 +1031,8 @@ reflow(struct terminal *term, struct row **new_grid, int new_cols, int new_rows,
                         new_row = grid_row_alloc(new_cols, true);
                         new_row->dirty = true;
                         new_grid[new_row_idx] = new_row;
-                    }
+                    } else
+                        memset(new_row->cells, 0, new_cols * sizeof(new_row->cells[0]));
                 }
 
                 new_col_idx++;