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-rw-r--r--src/crypto/internal/nistec/p256_asm_amd64.s2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/crypto/internal/nistec/p256_asm_amd64.s b/src/crypto/internal/nistec/p256_asm_amd64.s
index 84e4cee903..f5c008319b 100644
--- a/src/crypto/internal/nistec/p256_asm_amd64.s
+++ b/src/crypto/internal/nistec/p256_asm_amd64.s
@@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
+//go:build !purego
+
// This file contains constant-time, 64-bit assembly implementation of
// P256. The optimizations performed here are described in detail in:
// S.Gueron and V.Krasnov, "Fast prime field elliptic-curve cryptography with