diff --git a/src/ristretto255.cpp b/src/ristretto255.cpp
index 8e2e37c..620610a 100644
--- a/src/ristretto255.cpp
+++ b/src/ristretto255.cpp
@@ -1,28 +1,6 @@
 #include "stdafx.h"
 void randombytes_buf(std::span<byte> in) { randombytes_buf(&in[0], in.size_bytes()); }
 void randombytes_buf(std::span<   char> in) { randombytes_buf(&in[0], in.size_bytes()); }
-bool operator ==(const std::span<byte>& p, const std::span<byte>& q) {
-	bool breturn{ true };
-	for (auto xq = q.begin(); auto xp:p) {
-		if (xp != *xq++) {
-			breturn = false;
-			break;
-		}
-	}
-	return breturn;
-}
-
-bool operator !=(const std::span<byte>& p, const std::span<byte>& q) {
-	bool breturn{ false };
-	for (auto xq = q.begin(); auto xp:p) {
-		if (xp != *xq++) {
-			breturn = true;
-			break;
-		}
-	}
-	return breturn;
-}
-
 namespace ristretto255 {
 	bool scalar::constant_time_required{ true };
 	bool point::constant_time_required{ true };
diff --git a/src/ristretto255.h b/src/ristretto255.h
index 6ee40a4..1d98037 100644
--- a/src/ristretto255.h
+++ b/src/ristretto255.h
@@ -54,8 +54,6 @@
 
 void randombytes_buf(std::span<byte> in);
 void randombytes_buf(std::span<char   > in);
-bool operator !=(const std::span<byte>&, const std::span<byte>&);
-bool operator ==(const std::span<byte>&, const std::span<byte>&);
 namespace ro {
 
 	//	Decay to pointer is dangerously convenient,
@@ -497,7 +495,7 @@ namespace ristretto255 {
 			auto sj = ro::serialize(j);
 			int i = crypto_generichash_blake2b_update(
 				&u.st,
-				&sj[0],
+				(const unsigned char*)&sj[0],
 				sj.size()
 			);
 			if (i) throw HashReuseException();
diff --git a/src/unit_test.cpp b/src/unit_test.cpp
index dd473d1..ae8fb26 100644
--- a/src/unit_test.cpp
+++ b/src/unit_test.cpp
@@ -612,6 +612,28 @@ static bool TestShareSecretGenerationSpeed(void) {
 	return true;
 	}
 
+	bool operator ==(const std::span<byte>& p, const std::span<byte>& q) {
+		bool breturn{ true };
+		for (auto xq = q.begin(); auto xp:p) {
+			if (xp != *xq++) {
+				breturn = false;
+				break;
+			}
+		}
+		return breturn;
+	}
+
+	bool operator !=(const std::span<byte>& p, const std::span<byte>& q) {
+		bool breturn{ false };
+		for (auto xq = q.begin(); auto xp:p) {
+			if (xp != *xq++) {
+				breturn = true;
+				break;
+			}
+		}
+		return breturn;
+	}
+
 	static bool TestSignatures(void) {
 		try {
 			ILogMessage("\tTest Schnorr signatures.");