diff --git a/style/values/specified/grid.rs b/style/values/specified/grid.rs
index e3926d0964..fcd289a6a6 100644
--- a/style/values/specified/grid.rs
+++ b/style/values/specified/grid.rs
@@ -288,18 +288,6 @@ impl Parse for TrackList<LengthPercentage, Integer> {
     }
 }
 
-#[cfg(feature = "gecko")]
-#[inline]
-fn allow_grid_template_subgrids() -> bool {
-    true
-}
-
-#[cfg(feature = "servo")]
-#[inline]
-fn allow_grid_template_subgrids() -> bool {
-    false
-}
-
 #[cfg(feature = "gecko")]
 #[inline]
 fn allow_grid_template_masonry() -> bool {
@@ -331,10 +319,8 @@ impl GridTemplateComponent<LengthPercentage, Integer> {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-        if allow_grid_template_subgrids() {
-            if let Ok(t) = input.try_parse(|i| LineNameList::parse(context, i)) {
-                return Ok(GridTemplateComponent::Subgrid(Box::new(t)));
-            }
+        if let Ok(t) = input.try_parse(|i| LineNameList::parse(context, i)) {
+            return Ok(GridTemplateComponent::Subgrid(Box::new(t)));
         }
         if allow_grid_template_masonry() {
             if input