diff --git a/src/fontcache/spritefontcache.cpp b/src/fontcache/spritefontcache.cpp
index 9d945d394b..c9f75153b5 100644
--- a/src/fontcache/spritefontcache.cpp
+++ b/src/fontcache/spritefontcache.cpp
@@ -115,6 +115,14 @@ uint SpriteFontCache::GetGlyphWidth(GlyphID key)
 	return SpriteExists(sprite) ? GetSprite(sprite, SpriteType::Font)->width + ScaleFontTrad(this->fs != FS_NORMAL ? 1 : 0) : 0;
 }
 
+GlyphID SpriteFontCache::MapCharToGlyph(char32_t key, [[maybe_unused]] bool allow_fallback)
+{
+	assert(IsPrintable(key));
+	SpriteID sprite = this->GetUnicodeGlyph(key);
+	if (sprite == 0) return 0;
+	return SPRITE_GLYPH | key;
+}
+
 bool SpriteFontCache::GetDrawGlyphShadow()
 {
 	return false;
diff --git a/src/fontcache/spritefontcache.h b/src/fontcache/spritefontcache.h
index 4e43b8752c..61dd5866e2 100644
--- a/src/fontcache/spritefontcache.h
+++ b/src/fontcache/spritefontcache.h
@@ -23,7 +23,7 @@ public:
 	const Sprite *GetGlyph(GlyphID key) override;
 	uint GetGlyphWidth(GlyphID key) override;
 	bool GetDrawGlyphShadow() override;
-	GlyphID MapCharToGlyph(char32_t key, [[maybe_unused]] bool allow_fallback = true) override { assert(IsPrintable(key)); return SPRITE_GLYPH | key; }
+	GlyphID MapCharToGlyph(char32_t key, bool allow_fallback = true) override;
 	std::string GetFontName() override { return "sprite"; }
 	bool IsBuiltInFont() override { return true; }