diff --git a/include/dav1d/headers.rs b/include/dav1d/headers.rs
index 4055b131d..3762a0d80 100644
--- a/include/dav1d/headers.rs
+++ b/include/dav1d/headers.rs
@@ -57,16 +57,6 @@ where
     }
 }
 
-impl<R, D> DRav1d<Vec<R>, Vec<D>>
-where
-    R: Clone + Into<D>,
-{
-    pub fn push(&mut self, value: R) {
-        self.rav1d.push(value.clone());
-        self.dav1d.push(value.into());
-    }
-}
-
 // Constants from Section 3. "Symbols and abbreviated terms"
 pub const DAV1D_MAX_CDEF_STRENGTHS: usize = 8;
 pub const DAV1D_MAX_OPERATING_POINTS: usize = 32;
@@ -844,10 +834,11 @@ impl From<Rav1dITUTT35> for Dav1dITUTT35 {
 
 impl Rav1dITUTT35 {
     pub fn to_immut(
-        mutable: Arc<Mutex<DRav1d<Vec<Rav1dITUTT35>, Vec<Dav1dITUTT35>>>>,
+        mutable: Arc<Mutex<Vec<Rav1dITUTT35>>>,
     ) -> Arc<DRav1d<Box<[Rav1dITUTT35]>, Box<[Dav1dITUTT35]>>> {
-        let DRav1d { rav1d, dav1d: _ } = Arc::into_inner(mutable).unwrap().into_inner().unwrap();
-        let rav1d = rav1d.into_boxed_slice();
+        let mutable = Arc::into_inner(mutable).unwrap().into_inner().unwrap();
+        let immutable = mutable.into_boxed_slice();
+        let rav1d = immutable;
         let dav1d = rav1d.iter().cloned().map(Dav1dITUTT35::from).collect();
         Arc::new(DRav1d { rav1d, dav1d })
     }
diff --git a/src/internal.rs b/src/internal.rs
index 812ff41ad..bc9d05b24 100644
--- a/src/internal.rs
+++ b/src/internal.rs
@@ -12,7 +12,6 @@ use crate::include::dav1d::dav1d::Rav1dEventFlags;
 use crate::include::dav1d::dav1d::Rav1dInloopFilterType;
 use crate::include::dav1d::headers::DRav1d;
 use crate::include::dav1d::headers::Dav1dFrameHeader;
-use crate::include::dav1d::headers::Dav1dITUTT35;
 use crate::include::dav1d::headers::Dav1dSequenceHeader;
 use crate::include::dav1d::headers::Rav1dContentLightLevel;
 use crate::include::dav1d::headers::Rav1dFrameHeader;
@@ -325,7 +324,7 @@ pub struct Rav1dContext {
     pub(crate) frame_hdr: Option<Arc<DRav1d<Rav1dFrameHeader, Dav1dFrameHeader>>>, // TODO(kkysen) Previously pooled.
     pub(crate) content_light: Option<Arc<Rav1dContentLightLevel>>,
     pub(crate) mastering_display: Option<Arc<Rav1dMasteringDisplay>>,
-    pub(crate) itut_t35: Arc<Mutex<DRav1d<Vec<Rav1dITUTT35>, Vec<Dav1dITUTT35>>>>,
+    pub(crate) itut_t35: Arc<Mutex<Vec<Rav1dITUTT35>>>,
 
     // decoded output picture queue
     pub(crate) in_0: Rav1dData,
diff --git a/src/picture.rs b/src/picture.rs
index 3f92dff87..36d56007a 100644
--- a/src/picture.rs
+++ b/src/picture.rs
@@ -265,7 +265,7 @@ pub(crate) unsafe fn rav1d_thread_picture_alloc(
     c: &Rav1dContext,
     f: &mut Rav1dFrameData,
     bpc: c_int,
-    itut_t35: Arc<Mutex<DRav1d<Vec<Rav1dITUTT35>, Vec<Dav1dITUTT35>>>>,
+    itut_t35: Arc<Mutex<Vec<Rav1dITUTT35>>>,
 ) -> Rav1dResult {
     let p = &mut f.sr_cur;
     let have_frame_mt = c.n_fc > 1;