diff --git a/crypto/secp256k1/secp256.go b/crypto/secp256k1/secp256.go
index 35d0eef34a..9a7c06d7ce 100644
--- a/crypto/secp256k1/secp256.go
+++ b/crypto/secp256k1/secp256.go
@@ -8,10 +8,19 @@ package secp256k1
 /*
 #cgo CFLAGS: -I./libsecp256k1
 #cgo CFLAGS: -I./libsecp256k1/src/
+
+#ifdef __SIZEOF_INT128__
+#  define HAVE___INT128
+#  define USE_FIELD_5X52
+#  define USE_SCALAR_4X64
+#else
+#  define USE_FIELD_10X26
+#  define USE_SCALAR_8X32
+#endif
+
+#define USE_ENDOMORPHISM
 #define USE_NUM_NONE
-#define USE_FIELD_10X26
 #define USE_FIELD_INV_BUILTIN
-#define USE_SCALAR_8X32
 #define USE_SCALAR_INV_BUILTIN
 #define NDEBUG
 #include "./libsecp256k1/src/secp256k1.c"