diff --git a/Userland/Libraries/LibGfx/BitmapFont.cpp b/Userland/Libraries/LibGfx/BitmapFont.cpp
index 155b22de28..ddcc99dc64 100644
--- a/Userland/Libraries/LibGfx/BitmapFont.cpp
+++ b/Userland/Libraries/LibGfx/BitmapFont.cpp
@@ -377,7 +377,7 @@ FontMetrics Font::metrics() const
     return FontMetrics {
         .size = (float)presentation_size(),
         .x_height = (float)x_height(),
-        .glyph_width = (float)glyph_width('M'),
+        .advance_of_ascii_zero = (float)glyph_width('0'),
         .glyph_spacing = (float)glyph_spacing(),
     };
 }
diff --git a/Userland/Libraries/LibGfx/Font.h b/Userland/Libraries/LibGfx/Font.h
index 139ff23218..89a9fa4d02 100644
--- a/Userland/Libraries/LibGfx/Font.h
+++ b/Userland/Libraries/LibGfx/Font.h
@@ -89,7 +89,7 @@ private:
 struct FontMetrics {
     float size { 0 };
     float x_height { 0 };
-    float glyph_width { 0 };
+    float advance_of_ascii_zero { 0 };
     float glyph_spacing { 0 };
 };
 
diff --git a/Userland/Libraries/LibWeb/CSS/Length.cpp b/Userland/Libraries/LibWeb/CSS/Length.cpp
index a350a59fbd..42d19cca3e 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Length.cpp
@@ -76,7 +76,7 @@ float Length::relative_length_to_px(Gfx::IntRect const& viewport_rect, Gfx::Font
         return m_value * font_size;
     case Type::Ch:
         // FIXME: Use layout_node.font().glyph_height() when writing-mode is not horizontal-tb (it has to be implemented first)
-        return m_value * (font_metrics.glyph_width + font_metrics.glyph_spacing);
+        return m_value * (font_metrics.advance_of_ascii_zero + font_metrics.glyph_spacing);
     case Type::Rem:
         return m_value * root_font_size;
     case Type::Vw: