diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56045e29..3608f2f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - `--help` output for `--class` does not match man pages
 - Cursor and underlines always being black on very old hardware
+- Crash when using very low negative `font.offset`
 
 ## 0.11.0
 
diff --git a/alacritty/src/renderer/text/builtin_font.rs b/alacritty/src/renderer/text/builtin_font.rs
index aeee6d91..c0355be6 100644
--- a/alacritty/src/renderer/text/builtin_font.rs
+++ b/alacritty/src/renderer/text/builtin_font.rs
@@ -37,8 +37,9 @@ pub fn builtin_glyph(
 }
 
 fn box_drawing(character: char, metrics: &Metrics, offset: &Delta<i8>) -> RasterizedGlyph {
-    let height = (metrics.line_height as i32 + offset.y as i32) as usize;
-    let width = (metrics.average_advance as i32 + offset.x as i32) as usize;
+    // Ensure that width and height is at least one.
+    let height = (metrics.line_height as i32 + offset.y as i32).max(1) as usize;
+    let width = (metrics.average_advance as i32 + offset.x as i32).max(1) as usize;
     // Use one eight of the cell width, since this is used as a step size for block elemenets.
     let stroke_size = cmp::max((width as f32 / 8.).round() as usize, 1);
     let heavy_stroke_size = stroke_size * 2;