diff --git a/src/libsodium/crypto_sign/ed25519/ref10/sign.c b/src/libsodium/crypto_sign/ed25519/ref10/sign.c
index a27d5ce7..edf6af81 100644
--- a/src/libsodium/crypto_sign/ed25519/ref10/sign.c
+++ b/src/libsodium/crypto_sign/ed25519/ref10/sign.c
@@ -24,7 +24,7 @@ _crypto_sign_ed25519_ref10_hinit(crypto_hash_sha512_state *hs, int prehashed)
     }
 }
 
-static void
+static inline void
 _crypto_sign_ed25519_clamp(unsigned char k[32])
 {
     k[0] &= 248;