diff --git a/components/style/properties/shorthands/font.mako.rs b/components/style/properties/shorthands/font.mako.rs
index e55cdbe2fb8..bdedf348af7 100644
--- a/components/style/properties/shorthands/font.mako.rs
+++ b/components/style/properties/shorthands/font.mako.rs
@@ -418,6 +418,13 @@
                    nb_normals += 1;
                 }
             }
+        % if prop == "emoji":
+            else {
+                // The property was disabled, so we count it as 'normal' for the purpose
+                // of deciding how the shorthand can be serialized.
+                nb_normals += 1;
+            }
+        % endif
         % endfor