diff --git a/CHANGELOG.md b/CHANGELOG.md
index a67a830..2e9019f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Incorrect selection status of the first cell when selection is off screen
 - Backwards bracket selection
 - Stack overflow when printing shader creation error
+- Underline position for bitmap fonts
 
 ### Removed
 
diff --git a/alacritty/src/renderer/rects.rs b/alacritty/src/renderer/rects.rs
index 5bc353f..796abe6 100644
--- a/alacritty/src/renderer/rects.rs
+++ b/alacritty/src/renderer/rects.rs
@@ -86,7 +86,7 @@ impl RenderLine {
         let line_bottom = (start.line.0 as f32 + 1.) * size.cell_height;
         let baseline = line_bottom + metrics.descent;
 
-        let mut y = baseline - position - height / 2.;
+        let mut y = (baseline - position - height / 2.).ceil();
         let max_y = line_bottom - height;
         if y > max_y {
             y = max_y;
diff --git a/font/src/ft/mod.rs b/font/src/ft/mod.rs
index 5c5c4a7..f91acd0 100644
--- a/font/src/ft/mod.rs
+++ b/font/src/ft/mod.rs
@@ -108,7 +108,7 @@ impl Rasterize for FreeTypeRasterizer {
 
         // Fallback for bitmap fonts which do not provide underline metrics
         if underline_position == 0. {
-            underline_thickness = (descent / 5.).round();
+            underline_thickness = (descent.abs() / 5.).round();
             underline_position = descent / 2.;
         }