diff --git a/util/generate_build_files.py b/util/generate_build_files.py
index 6321c5c..acc693a 100644
--- a/util/generate_build_files.py
+++ b/util/generate_build_files.py
@@ -44,6 +44,9 @@
         'src/crypto/curve25519/asm/x25519-asm-arm.S',
         'src/crypto/poly1305/poly1305_arm_asm.S',
     ],
+    ('linux', 'x86_64'): [
+        'src/crypto/curve25519/asm/x25519-asm-x86_64.S',
+    ],
 }