diff --git a/av1/av1.cmake b/av1/av1.cmake
index 089dea4..bcffa76 100644
--- a/av1/av1.cmake
+++ b/av1/av1.cmake
@@ -392,13 +392,14 @@
 list(APPEND AOM_AV1_ENCODER_INTRIN_SSE2
             "${AOM_ROOT}/av1/encoder/x86/av1_fwd_txfm_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/av1_fwd_txfm_sse2.h"
+            "${AOM_ROOT}/av1/encoder/x86/av1_k_means_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/av1_quantize_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/encodetxb_sse2.c"
+            "${AOM_ROOT}/av1/encoder/x86/error_intrin_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/highbd_block_error_intrin_sse2.c"
-            "${AOM_ROOT}/av1/encoder/x86/temporal_filter_sse2.c"
-            "${AOM_ROOT}/av1/encoder/x86/av1_k_means_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/highbd_temporal_filter_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/reconinter_enc_sse2.c"
+            "${AOM_ROOT}/av1/encoder/x86/temporal_filter_sse2.c"
             "${AOM_ROOT}/av1/encoder/x86/wedge_utils_sse2.c")
 
 if(CONFIG_AV1_TEMPORAL_DENOISING)
diff --git a/av1/common/av1_rtcd_defs.pl b/av1/common/av1_rtcd_defs.pl
index 8c8fbaea..7f2cd7e 100644
--- a/av1/common/av1_rtcd_defs.pl
+++ b/av1/common/av1_rtcd_defs.pl
@@ -325,7 +325,7 @@
   specialize qw/av1_block_error sse2 avx2 neon/;
 
   add_proto qw/int64_t av1_block_error_lp/, "const int16_t *coeff, const int16_t *dqcoeff, intptr_t block_size";
-  specialize qw/av1_block_error_lp avx2 neon/;
+  specialize qw/av1_block_error_lp sse2 avx2 neon/;
 
   add_proto qw/void av1_quantize_fp/, "const tran_low_t *coeff_ptr, intptr_t n_coeffs, const int16_t *zbin_ptr, const int16_t *round_ptr, const int16_t *quant_ptr, const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr, uint16_t *eob_ptr, const int16_t *scan, const int16_t *iscan";
   specialize qw/av1_quantize_fp sse2 avx2 neon/;
diff --git a/av1/encoder/x86/error_intrin_sse2.c b/av1/encoder/x86/error_intrin_sse2.c
new file mode 100644
index 0000000..e876db1
--- /dev/null
+++ b/av1/encoder/x86/error_intrin_sse2.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2021, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <emmintrin.h>  // SSE2
+
+#include "config/av1_rtcd.h"
+
+#include "aom/aom_integer.h"
+
+static AOM_INLINE __m128i reduce_sum_epi64(__m128i reg) {
+  __m128i reg_hi = _mm_srli_si128(reg, 8);
+  reg = _mm_add_epi64(reg, reg_hi);
+
+  return reg;
+}
+
+int64_t av1_block_error_lp_sse2(const int16_t *coeff, const int16_t *dqcoeff,
+                                intptr_t block_size) {
+  assert(block_size % 16 == 0);
+  assert(block_size >= 16);
+
+  const __m128i zero = _mm_setzero_si128();
+  __m128i accum_0 = zero;
+  __m128i accum_1 = zero;
+
+  for (int i = 0; i < block_size; i += 16) {
+    // Load 8 elements for coeff and dqcoeff.
+    const __m128i _coeff_0 = _mm_loadu_si128((const __m128i *)coeff);
+    const __m128i _coeff_1 = _mm_loadu_si128((const __m128i *)(coeff + 8));
+    const __m128i _dqcoeff_0 = _mm_loadu_si128((const __m128i *)dqcoeff);
+    const __m128i _dqcoeff_1 = _mm_loadu_si128((const __m128i *)(dqcoeff + 8));
+    // Compute the diff
+    const __m128i diff_0 = _mm_sub_epi16(_dqcoeff_0, _coeff_0);
+    const __m128i diff_1 = _mm_sub_epi16(_dqcoeff_1, _coeff_1);
+    // Compute the error
+    const __m128i error_0 = _mm_madd_epi16(diff_0, diff_0);
+    const __m128i error_1 = _mm_madd_epi16(diff_1, diff_1);
+
+    const __m128i error_lo_0 = _mm_unpacklo_epi32(error_0, zero);
+    const __m128i error_lo_1 = _mm_unpacklo_epi32(error_1, zero);
+    const __m128i error_hi_0 = _mm_unpackhi_epi32(error_0, zero);
+    const __m128i error_hi_1 = _mm_unpackhi_epi32(error_1, zero);
+
+    // Accumulate
+    accum_0 = _mm_add_epi64(accum_0, error_lo_0);
+    accum_1 = _mm_add_epi64(accum_1, error_lo_1);
+    accum_0 = _mm_add_epi64(accum_0, error_hi_0);
+    accum_1 = _mm_add_epi64(accum_1, error_hi_1);
+
+    // Advance
+    coeff += 16;
+    dqcoeff += 16;
+  }
+
+  __m128i accum = _mm_add_epi64(accum_0, accum_1);
+  // Reduce sum the register
+  accum = reduce_sum_epi64(accum);
+
+  // Store the results.
+#if ARCH_X86_64
+  return _mm_cvtsi128_si64(accum);
+#else
+  int64_t result;
+  _mm_storel_epi64((__m128i *)&result, accum);
+  return result;
+#endif  // ARCH_X86_64
+}
diff --git a/test/error_block_test.cc b/test/error_block_test.cc
index 1e3764c..e4befd5 100644
--- a/test/error_block_test.cc
+++ b/test/error_block_test.cc
@@ -259,7 +259,9 @@
              AOM_BITS_8),
 #endif
   make_tuple(&BlockError8BitWrapper<av1_block_error_sse2>,
-             &BlockError8BitWrapper<av1_block_error_c>, AOM_BITS_8)
+             &BlockError8BitWrapper<av1_block_error_c>, AOM_BITS_8),
+  make_tuple(&BlockErrorLpWrapper<av1_block_error_lp_sse2>,
+             &BlockErrorLpWrapper<av1_block_error_lp_c>, AOM_BITS_8)
 };
 
 INSTANTIATE_TEST_SUITE_P(SSE2, ErrorBlockTest,