diff --git a/components/style/properties/shorthands/text.mako.rs b/components/style/properties/shorthands/text.mako.rs
index 3f892affdf5..eb0c5dc4003 100644
--- a/components/style/properties/shorthands/text.mako.rs
+++ b/components/style/properties/shorthands/text.mako.rs
@@ -94,6 +94,7 @@
                     dest.write_str(" ")?;
                 }
                 self.text_decoration_thickness.to_css(dest)?;
+                has_value = true;
             }
 
             if !is_solid_style {