diff --git a/crypto/blake2.h b/crypto/blake2.h
index cd89adb6..052afe34 100644
--- a/crypto/blake2.h
+++ b/crypto/blake2.h
@@ -92,6 +92,11 @@ extern "C" {
 
   void blake2_init_accel(void);
 
+  /* Export optimized versions to silent -Wmissing-prototypes warnings. */
+  void blake2b_compress_avx2( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
+  void blake2b_compress_sse2( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
+  void blake2b_compress_sse41( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
+
 #if defined(__cplusplus)
 }
 #endif
diff --git a/crypto/blake2b-ref.c b/crypto/blake2b-ref.c
index c47c92ad..7b2e410a 100644
--- a/crypto/blake2b-ref.c
+++ b/crypto/blake2b-ref.c
@@ -220,10 +220,6 @@ static void blake2b_compress_ref( blake2b_state *S, const uint8_t block[BLAKE2B_
 #undef G
 #undef ROUND
 
-void blake2b_compress_sse2( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
-void blake2b_compress_sse41( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
-void blake2b_compress_avx2( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
-
 static void (*blake2b_compress)( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] ) = blake2b_compress_ref;
 
 void blake2_init_accel(void)