diff --git a/src/itx.rs b/src/itx.rs
index e512b67e2..a2646d917 100644
--- a/src/itx.rs
+++ b/src/itx.rs
@@ -18,12 +18,14 @@ use crate::include::common::intops::iclip;
 use crate::include::dav1d::picture::{
     FFISafeRav1dPictureDataComponentOffset, Rav1dPictureDataComponentOffset,
 };
+#[cfg(not(all(feature = "asm", target_feature = "neon")))]
+use crate::itx_1d::rav1d_inv_wht4_1d_c;
 use crate::itx_1d::{
     rav1d_inv_adst16_1d_c, rav1d_inv_adst4_1d_c, rav1d_inv_adst8_1d_c, rav1d_inv_dct16_1d_c,
     rav1d_inv_dct32_1d_c, rav1d_inv_dct4_1d_c, rav1d_inv_dct64_1d_c, rav1d_inv_dct8_1d_c,
     rav1d_inv_flipadst16_1d_c, rav1d_inv_flipadst4_1d_c, rav1d_inv_flipadst8_1d_c,
     rav1d_inv_identity16_1d_c, rav1d_inv_identity32_1d_c, rav1d_inv_identity4_1d_c,
-    rav1d_inv_identity8_1d_c, rav1d_inv_wht4_1d_c,
+    rav1d_inv_identity8_1d_c,
 };
 use crate::levels::{
     TxfmSize, TxfmType, ADST_ADST, ADST_DCT, ADST_FLIPADST, DCT_ADST, DCT_DCT, DCT_FLIPADST,
@@ -187,7 +189,10 @@ fn inv_txfm_add_rust<const W: usize, const H: usize, const TYPE: TxfmType, BD: B
         H_FLIPADST => (Identity, FlipAdst),
         V_ADST => (Adst, Identity),
         V_FLIPADST => (FlipAdst, Identity),
+
+        #[cfg(not(all(feature = "asm", target_feature = "neon")))]
         WHT_WHT if (W, H) == (4, 4) => return inv_txfm_add_wht_wht_4x4_rust(dst, coeff, bd),
+
         _ => unreachable!(),
     };
 
@@ -288,6 +293,7 @@ pub struct Rav1dInvTxfmDSPContext {
     pub itxfm_add: [[itxfm::Fn; N_TX_TYPES_PLUS_LL]; TxfmSize::COUNT],
 }
 
+#[cfg(not(all(feature = "asm", target_feature = "neon")))]
 fn inv_txfm_add_wht_wht_4x4_rust<BD: BitDepth>(
     dst: Rav1dPictureDataComponentOffset,
     coeff: &mut [BD::Coef],
diff --git a/src/itx_1d.c b/src/itx_1d.c
index ca14fc8c4..8f75c653a 100644
--- a/src/itx_1d.c
+++ b/src/itx_1d.c
@@ -1016,6 +1016,10 @@ void dav1d_inv_identity32_1d_c(int32_t *const c, const ptrdiff_t stride,
         c[stride * i] *= 4;
 }
 
+#if !(HAVE_ASM && TRIM_DSP_FUNCTIONS && ( \
+  ARCH_AARCH64 || \
+  (ARCH_ARM && (defined(__ARM_NEON) || defined(__APPLE__) || defined(_WIN32))) \
+))
 void dav1d_inv_wht4_1d_c(int32_t *const c, const ptrdiff_t stride) {
     assert(stride > 0);
     const int in0 = c[0 * stride], in1 = c[1 * stride];
@@ -1032,3 +1036,4 @@ void dav1d_inv_wht4_1d_c(int32_t *const c, const ptrdiff_t stride) {
     c[2 * stride] = t1;
     c[3 * stride] = t2 + t1;
 }
+#endif
diff --git a/src/itx_1d.rs b/src/itx_1d.rs
index 1dd0b453a..7970c335c 100644
--- a/src/itx_1d.rs
+++ b/src/itx_1d.rs
@@ -1133,6 +1133,7 @@ pub fn rav1d_inv_identity32_1d_c(c: &mut [i32], stride: NonZeroUsize, _min: c_in
     }
 }
 
+#[cfg(not(all(feature = "asm", target_feature = "neon")))]
 pub fn rav1d_inv_wht4_1d_c(c: &mut [i32], stride: NonZeroUsize) {
     let stride = stride.get();
 
diff --git a/src/itx_tmpl.c b/src/itx_tmpl.c
index d3859892d..1a37c3d54 100644
--- a/src/itx_tmpl.c
+++ b/src/itx_tmpl.c
@@ -159,6 +159,10 @@ inv_txfm_fn64(64, 16, 2)
 inv_txfm_fn64(64, 32, 1)
 inv_txfm_fn64(64, 64, 2)
 
+#if !(HAVE_ASM && TRIM_DSP_FUNCTIONS && ( \
+  ARCH_AARCH64 || \
+  (ARCH_ARM && (defined(__ARM_NEON) || defined(__APPLE__) || defined(_WIN32))) \
+))
 static void inv_txfm_add_wht_wht_4x4_c(pixel *dst, const ptrdiff_t stride,
                                        coef *const coeff, const int eob
                                        HIGHBD_DECL_SUFFIX)
@@ -179,6 +183,7 @@ static void inv_txfm_add_wht_wht_4x4_c(pixel *dst, const ptrdiff_t stride,
         for (int x = 0; x < 4; x++)
             dst[x] = iclip_pixel(dst[x] + *c++);
 }
+#endif
 
 #if HAVE_ASM
 #if ARCH_AARCH64 || ARCH_ARM
@@ -232,7 +237,12 @@ COLD void bitfn(dav1d_itx_dsp_init)(Dav1dInvTxfmDSPContext *const c, int bpc) {
     c->itxfm_add[pfx##TX_##w##X##h][V_ADST] = \
         inv_txfm_add_identity_adst_##w##x##h##_c; \
 
+#if !(HAVE_ASM && TRIM_DSP_FUNCTIONS && ( \
+  ARCH_AARCH64 || \
+  (ARCH_ARM && (defined(__ARM_NEON) || defined(__APPLE__) || defined(_WIN32))) \
+))
     c->itxfm_add[TX_4X4][WHT_WHT] = inv_txfm_add_wht_wht_4x4_c;
+#endif
     assign_itx_all_fn84( 4,  4, );
     assign_itx_all_fn84( 4,  8, R);
     assign_itx_all_fn84( 4, 16, R);