diff --git a/src/AVX-512/vfmadd213sd-zzz.S b/src/AVX-512/vfmadd213sd-zzz.S
index eecc98a..9fc742d 100644
--- a/src/AVX-512/vfmadd213sd-zzz.S
+++ b/src/AVX-512/vfmadd213sd-zzz.S
@@ -23,17 +23,25 @@ latency:
         vpcmpeqw xmm0, xmm0, xmm0       # all ones
         vpsllq xmm0, xmm0, 54           # logical left shift: 11111110..0 (54 = 64 - (11 - 1))
         vpsrlq xmm0, xmm0, 2            # logical right shift: 1 bit for sign; leading mantissa bit is zero
+        # expand from SSE to AVX
+        vinsertf128 ymm0, ymm0, xmm0, 0x1
+        # expand from AVX to AVX-512
+        vinsertf64x4 zmm0, zmm0, ymm0, 0x1
         # copy SP 1.0
-        vmovaps xmm1, xmm0
+        vmovaps zmm1, zmm0
+
+        # Mark registers AVX-512
+        vmovaps zmm0, zmm0
+        vmovaps zmm1, zmm1
 loop:
         inc       i
-        INSTR     xmm0, xmm1, xmm1
-        INSTR     xmm0, xmm1, xmm1
-        INSTR     xmm0, xmm1, xmm1
+        INSTR     zmm0, zmm1, zmm1
+        INSTR     zmm0, zmm1, zmm1
+        INSTR     zmm0, zmm1, zmm1
         cmp       i, N
-        INSTR     xmm0, xmm1, xmm1
-        INSTR     xmm0, xmm1, xmm1
-        INSTR     xmm0, xmm1, xmm1
+        INSTR     zmm0, zmm1, zmm1
+        INSTR     zmm0, zmm1, zmm1
+        INSTR     zmm0, zmm1, zmm1
         jl        loop
 done:
         mov  rsp, rbp