diff --git a/src/codegen_new/codegen_backend_arm64_ops.c b/src/codegen_new/codegen_backend_arm64_ops.c
index 915cae93d..21f0df34d 100644
--- a/src/codegen_new/codegen_backend_arm64_ops.c
+++ b/src/codegen_new/codegen_backend_arm64_ops.c
@@ -180,6 +180,7 @@
 #    define OPCODE_SQSUB_V8B          (0x0e202c00)
 #    define OPCODE_SQSUB_V4H          (0x0e602c00)
 #    define OPCODE_SQXTN_V8B_8H       (0x0e214800)
+#    define OPCODE_SQXTUN_V8B_8H      (0x7e212800)
 #    define OPCODE_SQXTN_V4H_4S       (0x0e614800)
 #    define OPCODE_SHL_VD             (0x0f005400)
 #    define OPCODE_SHL_VQ             (0x4f005400)
@@ -1225,6 +1226,12 @@ host_arm64_SQXTN_V8B_8H(codeblock_t *block, int dst_reg, int src_reg)
 {
     codegen_addlong(block, OPCODE_SQXTN_V8B_8H | Rd(dst_reg) | Rn(src_reg));
 }
+
+void host_arm64_SQXTUN_V8B_8H(codeblock_t *block, int dst_reg, int src_reg)
+{
+    codegen_addlong(block, OPCODE_SQXTUN_V8B_8H | Rd(dst_reg) | Rn(src_reg));
+}
+
 void
 host_arm64_SQXTN_V4H_4S(codeblock_t *block, int dst_reg, int src_reg)
 {
diff --git a/src/codegen_new/codegen_backend_arm64_ops.h b/src/codegen_new/codegen_backend_arm64_ops.h
index df751b4aa..084bbb404 100644
--- a/src/codegen_new/codegen_backend_arm64_ops.h
+++ b/src/codegen_new/codegen_backend_arm64_ops.h
@@ -184,6 +184,7 @@ void host_arm64_SQSUB_V8B(codeblock_t *block, int dst_reg, int src_n_reg, int sr
 void host_arm64_SQSUB_V4H(codeblock_t *block, int dst_reg, int src_n_reg, int src_m_reg);
 
 void host_arm64_SQXTN_V8B_8H(codeblock_t *block, int dst_reg, int src_reg);
+void host_arm64_SQXTUN_V8B_8H(codeblock_t *block, int dst_reg, int src_reg);
 void host_arm64_SQXTN_V4H_4S(codeblock_t *block, int dst_reg, int src_reg);
 
 void host_arm64_SHL_V4H(codeblock_t *block, int dst_reg, int src_reg, int shift);
diff --git a/src/codegen_new/codegen_backend_arm64_uops.c b/src/codegen_new/codegen_backend_arm64_uops.c
index 2bb6281ff..f6038f71f 100644
--- a/src/codegen_new/codegen_backend_arm64_uops.c
+++ b/src/codegen_new/codegen_backend_arm64_uops.c
@@ -1480,8 +1480,8 @@ codegen_PACKUSWB(codeblock_t *block, uop_t *uop)
     int dest_size = IREG_GET_SIZE(uop->dest_reg_a_real), src_size_b = IREG_GET_SIZE(uop->src_reg_b_real);
 
     if (REG_IS_Q(dest_size) && REG_IS_Q(src_size_b) && uop->dest_reg_a_real == uop->src_reg_a_real) {
-        host_arm64_UQXTN_V8B_8H(block, REG_V_TEMP, src_reg_b);
-        host_arm64_UQXTN_V8B_8H(block, dest_reg, dest_reg);
+        host_arm64_SQXTUN_V8B_8H(block, REG_V_TEMP, src_reg_b);
+        host_arm64_SQXTUN_V8B_8H(block, dest_reg, dest_reg);
         host_arm64_ZIP1_V2S(block, dest_reg, dest_reg, REG_V_TEMP);
     } else
         fatal("PACKUSWB %02x %02x %02x\n", uop->dest_reg_a_real, uop->src_reg_a_real, uop->src_reg_b_real);