diff --git a/include/private/dsp/arch/x86/avx512/msmatrix.h b/include/private/dsp/arch/x86/avx512/msmatrix.h
index 002fdd96..cfb1be5c 100644
--- a/include/private/dsp/arch/x86/avx512/msmatrix.h
+++ b/include/private/dsp/arch/x86/avx512/msmatrix.h
@@ -273,8 +273,8 @@ namespace lsp
             ARCH_X86_ASM(
                 __ASM_EMIT("xor             %[off], %[off]")
                 // 64x blocks
-                __ASM_EMIT32("subl          $32, %[count]")
-                __ASM_EMIT64("sub           $32, %[count]")
+                __ASM_EMIT32("subl          $64, %[count]")
+                __ASM_EMIT64("sub           $64, %[count]")
                 __ASM_EMIT("jb              2f")
                 __ASM_EMIT("1:")
                 __ASM_EMIT("vmovups         0x00(%[mid], %[off]), %%zmm0")              // zmm0 = m
diff --git a/src/test/utest/msmatrix/conv2.cpp b/src/test/utest/msmatrix/conv2.cpp
index f22e21e4..540e3c46 100644
--- a/src/test/utest/msmatrix/conv2.cpp
+++ b/src/test/utest/msmatrix/conv2.cpp
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2023 Linux Studio Plugins Project <https://lsp-plug.in/>
- *           (C) 2023 Vladimir Sadovnikov <sadko4u@gmail.com>
+ * Copyright (C) 2024 Linux Studio Plugins Project <https://lsp-plug.in/>
+ *           (C) 2024 Vladimir Sadovnikov <sadko4u@gmail.com>
  *
  * This file is part of lsp-dsp-lib
  * Created on: 31 мар. 2020 г.
@@ -85,7 +85,7 @@ UTEST_BEGIN("dsp.msmatrix", conv2)
             return;
 
         UTEST_FOREACH(count, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-                32, 64, 65, 100, 999, 0xfff)
+                32, 33, 34, 35, 36, 37, 38, 39, 40, 63, 64, 65, 100, 999, 0xfff)
         {
             for (size_t mask=0; mask <= 0x0f; ++mask)
             {
diff --git a/src/test/utest/msmatrix/conv2x1.cpp b/src/test/utest/msmatrix/conv2x1.cpp
index ba75853e..889e8a74 100644
--- a/src/test/utest/msmatrix/conv2x1.cpp
+++ b/src/test/utest/msmatrix/conv2x1.cpp
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2023 Linux Studio Plugins Project <https://lsp-plug.in/>
- *           (C) 2023 Vladimir Sadovnikov <sadko4u@gmail.com>
+ * Copyright (C) 2024 Linux Studio Plugins Project <https://lsp-plug.in/>
+ *           (C) 2024 Vladimir Sadovnikov <sadko4u@gmail.com>
  *
  * This file is part of lsp-dsp-lib
  * Created on: 31 мар. 2020 г.
@@ -97,7 +97,7 @@ UTEST_BEGIN("dsp.msmatrix", conv2x1)
             return;
 
         UTEST_FOREACH(count, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-                32, 64, 65, 100, 999, 0xfff)
+            32, 33, 34, 35, 36, 37, 38, 39, 40, 63, 64, 65, 100, 999, 0xfff)
         {
             for (size_t mask=0; mask <= 0x07; ++mask)
             {