diff --git a/ggml-sycl.cpp b/ggml-sycl.cpp
index 6d56845821f69..65f36ae7a6522 100644
--- a/ggml-sycl.cpp
+++ b/ggml-sycl.cpp
@@ -4894,7 +4894,6 @@ static void dequantize_block_iq1_s(const void * __restrict__ vx, dst_t * __restr
                                      const uint64_t *iq1s_grid,
                                      const uint8_t *ksigns_iq2xs,
                                      const uint8_t *kmask_iq2xs) {
-
     const int i = item_ct1.get_group(2);
     const block_iq1_s * x = (const block_iq1_s  *) vx;
 
@@ -4903,11 +4902,15 @@ static void dequantize_block_iq1_s(const void * __restrict__ vx, dst_t * __restr
     const int il = tid/8; // 0...3
     const int ib = tid%8; // 0...7
     dst_t * y = yy + i*QK_K + 32*ib + 8*il;
-    const int i8 = 4*ib+il;
-    uint8_t h = x[i].scales[i8/2] >> 4*(i8%2);
-    const int8_t * grid = (const int8_t *)(iq1s_grid + (x[i].qs[i8] | ((h & 8) << 5)));
-    const float d = (float)x[i].d * (2*(h & 7) + 1);
-    for (int j = 0; j < 8; ++j) y[j] = d * grid[j];
+    const uint8_t  * qs = x[i].qs + 8*ib;
+    const uint8_t  * grid1 = (const uint8_t *)(iq1s_grid + qs[2*il+0]);
+    const uint8_t  * grid2 = (const uint8_t *)(iq1s_grid + qs[2*il+1]);
+    const float d = (float)x[i].d * (2*((x[i].qh[ib] >> 12) & 0xf) + 1);
+    const uint8_t signs = ksigns_iq2xs[(x[i].qh[ib] >> 3*il) & 7];
+    for (int j = 0; j < 4; ++j) {
+        y[j+0] = d * grid1[j] * (signs & kmask_iq2xs[j+0] ? -1.f : 1.f);
+        y[j+4] = d * grid2[j] * (signs & kmask_iq2xs[j+4] ? -1.f : 1.f);
+    }
 #else
     assert(false);
 #endif
@@ -7808,23 +7811,22 @@ vec_dot_iq1_s_q8_1(const void *__restrict__ vbq,
     const block_iq1_s * bq1 = (const block_iq1_s *) vbq;
 
     const int ib32 = iqs;
-    int sumi1 = 0, sumi2 = 0, sumi3 = 0, sumi4 = 0;
-    const uint8_t h1 = bq1->scales[2*ib32+0];
-    const uint8_t h2 = bq1->scales[2*ib32+1];
-    const int * q8 = (const int *)bq8_1[ib32].qs;
-    const int * grid1 = (const int *)(iq1s_grid + (bq1->qs[4*ib32+0] | ((h1 & 0x08) << 5)));
-    const int * grid2 = (const int *)(iq1s_grid + (bq1->qs[4*ib32+1] | ((h1 & 0x80) << 1)));
-    const int * grid3 = (const int *)(iq1s_grid + (bq1->qs[4*ib32+2] | ((h2 & 0x08) << 5)));
-    const int * grid4 = (const int *)(iq1s_grid + (bq1->qs[4*ib32+3] | ((h2 & 0x80) << 1)));
-    for (int j = 0; j < 2; ++j) {
-        sumi1 = dpct::dp4a(q8[j+0], grid1[j], sumi1);
-        sumi2 = dpct::dp4a(q8[j+2], grid2[j], sumi2);
-        sumi3 = dpct::dp4a(q8[j+4], grid3[j], sumi3);
-        sumi4 = dpct::dp4a(q8[j+6], grid4[j], sumi4);
-    }
-    const float d = (float)bq1->d  * bq8_1[ib32].ds[0];
-    return d * (sumi1 * (2*(h1 & 7) + 1) + sumi2 * (2*((h1 >> 4) & 7) + 1) +
-                sumi3 * (2*(h2 & 7) + 1) + sumi4 * (2*((h2 >> 4) & 7) + 1));
+    const uint8_t  * qs = bq1->qs + 4*ib32;
+    const int8_t   * q8 = bq8_1[ib32].qs;
+    int sumi = 0;
+    for (int l = 0; l < 4; ++l) {
+        const uint32_t * grid = (const uint32_t *)(iq1s_grid + qs[l]);
+        const uint32_t * signs = (const uint32_t *)(ksigns64 + (qs[l] >> 8));
+        const int grid_l = dpct::vectorized_binary<sycl::uchar4>(
+            grid[0] ^ signs[0], signs[0], std::minus<>());
+        const int grid_h = dpct::vectorized_binary<sycl::uchar4>(
+            grid[1] ^ signs[1], signs[1], std::minus<>());
+        sumi = dpct::dp4a(grid_l, *((int *)q8 + 0), sumi);
+        sumi = dpct::dp4a(grid_h, *((int *)q8 + 1), sumi);
+        q8 += 8;
+    }
+    const float d = (float)bq1->d * bq8_1[ib32].ds[0] * 0.25f;
+    return d * sumi;
 #else
     assert(false);
     return 0.f;