diff --git a/src/openrct2/drawing/font.c b/src/openrct2/drawing/font.c
index b933471302..34437053d0 100644
--- a/src/openrct2/drawing/font.c
+++ b/src/openrct2/drawing/font.c
@@ -124,7 +124,9 @@ sint32 font_sprite_get_codepoint_offset(sint32 codepoint)
 sint32 font_sprite_get_codepoint_width(sint32 fontSpriteBase, sint32 codepoint)
 {
     uint32 spriteFontIdx = fontSpriteBase + font_sprite_get_codepoint_offset(codepoint);
+#ifdef NO_RCT2
     openrct2_assert(spriteFontIdx < countof(_spriteFontCharacterWidths), "Invalid font index %u", spriteFontIdx);
+#endif
     return _spriteFontCharacterWidths[spriteFontIdx];
 }