diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/font/types/unicode/unihex/UnihexFontType.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/font/types/unicode/unihex/UnihexFontType.kt
index ec3b9916c..e2b88a005 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/font/types/unicode/unihex/UnihexFontType.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/font/types/unicode/unihex/UnihexFontType.kt
@@ -1,6 +1,6 @@
 /*
  * Minosoft
- * Copyright (C) 2020-2025 Moritz Zwerger
+ * Copyright (C) 2020-2026 Moritz Zwerger
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
  *
@@ -126,9 +126,10 @@ class UnihexFontType(
             while (this.available() > 0) {
                 val codePoint = readHexInt()
                 if (codePoint == -1) continue
-                val data = this.readUnihexData(buffer)
-                chars[codePoint] = data
-                totalWidth += data.size / (UnifontRasterizer.HEIGHT / Byte.SIZE_BITS)
+                val data = readUnihexData(buffer)
+                if (chars.putIfAbsent(codePoint, data) == null) {
+                    totalWidth += data.size / (UnifontRasterizer.HEIGHT / Byte.SIZE_BITS)
+                }
             }
 
             return totalWidth