diff --git a/ports/geckolib/properties.mako.rs b/ports/geckolib/properties.mako.rs
index 0257ba9e8d6..2d291dd9618 100644
--- a/ports/geckolib/properties.mako.rs
+++ b/ports/geckolib/properties.mako.rs
@@ -360,6 +360,7 @@ impl Debug for ${style_struct.gecko_ffi_name} {
 
    # Types used with predefined_type()-defined properties that we can auto-generate.
    predefined_types = {
+       "LengthOrPercentage": impl_style_coord,
        "LengthOrPercentageOrAuto": impl_style_coord,
        "Number": impl_simple,
        "Opacity": impl_simple,