diff --git a/Sources/MarkdownUI/Theme/TextStyle/Styles/Font+FontProperties.swift b/Sources/MarkdownUI/Theme/TextStyle/Styles/Font+FontProperties.swift
index 85301413..e2b97511 100644
--- a/Sources/MarkdownUI/Theme/TextStyle/Styles/Font+FontProperties.swift
+++ b/Sources/MarkdownUI/Theme/TextStyle/Styles/Font+FontProperties.swift
@@ -9,7 +9,7 @@ extension Font {
     case .system(let design):
       font = .system(size: size, design: design)
     case .custom(let name):
-      font = .custom(name, size: size)
+      font = .custom(name, fixedSize: size)
     }
 
     switch fontProperties.familyVariant {
diff --git a/Tests/MarkdownUITests/FontPropertiesTests.swift b/Tests/MarkdownUITests/FontPropertiesTests.swift
index 58ce8b8f..45ca6411 100644
--- a/Tests/MarkdownUITests/FontPropertiesTests.swift
+++ b/Tests/MarkdownUITests/FontPropertiesTests.swift
@@ -20,7 +20,7 @@
 
       // then
       XCTAssertEqual(
-        Font.custom("Menlo", size: FontProperties.defaultSize),
+        Font.custom("Menlo", fixedSize: FontProperties.defaultSize),
         Font.withProperties(fontProperties)
       )