diff --git a/deps/ox/src/ox/mc/intops.hpp b/deps/ox/src/ox/mc/intops.hpp
index 42effc705..c378a9c22 100644
--- a/deps/ox/src/ox/mc/intops.hpp
+++ b/deps/ox/src/ox/mc/intops.hpp
@@ -114,7 +114,7 @@ static_assert(countBytes(0b01111111) == 8);
 static_assert(countBytes(0b11111111) == 9);
 
 template<typename I>
-Result<I> decodeInteger(uint8_t buff[9], std::size_t buffLen, std::size_t *bytesRead) noexcept {
+Result<I> decodeInteger(const uint8_t buff[9], std::size_t buffLen, std::size_t *bytesRead) noexcept {
 	const auto bytes = countBytes(buff[0]);
 	if (bytes == 9) {
 		*bytesRead = bytes;
diff --git a/deps/ox/src/ox/mc/presenceindicator.cpp b/deps/ox/src/ox/mc/presenceindicator.cpp
index 36f1c66d9..ba854a50f 100644
--- a/deps/ox/src/ox/mc/presenceindicator.cpp
+++ b/deps/ox/src/ox/mc/presenceindicator.cpp
@@ -12,8 +12,9 @@
 
 namespace ox {
 
-FieldPresenceIndicator::FieldPresenceIndicator(uint8_t *mask, std::size_t maxLen) {
-	m_mask = mask;
+FieldPresenceIndicator::FieldPresenceIndicator(const uint8_t *mask, std::size_t maxLen) {
+	// TODO: have separate read only version of this class
+	m_mask = const_cast<uint8_t*>(mask);
 	m_maskLen = maxLen;
 }
 
diff --git a/deps/ox/src/ox/mc/presenceindicator.hpp b/deps/ox/src/ox/mc/presenceindicator.hpp
index 799c3d5ab..6cff766b2 100644
--- a/deps/ox/src/ox/mc/presenceindicator.hpp
+++ b/deps/ox/src/ox/mc/presenceindicator.hpp
@@ -20,7 +20,7 @@ class FieldPresenceIndicator {
 		std::size_t m_fields = 0;
 
 	public:
-		FieldPresenceIndicator(uint8_t *mask, std::size_t maxLen);
+		FieldPresenceIndicator(const uint8_t *mask, std::size_t maxLen);
 
 		Result<bool> get(std::size_t i) const;
 
diff --git a/deps/ox/src/ox/mc/read.cpp b/deps/ox/src/ox/mc/read.cpp
index d0914cb92..6b20a3123 100644
--- a/deps/ox/src/ox/mc/read.cpp
+++ b/deps/ox/src/ox/mc/read.cpp
@@ -14,7 +14,7 @@
 
 namespace ox {
 
-MetalClawReader::MetalClawReader(uint8_t *buff, std::size_t buffLen, int unionIdx, MetalClawReader *parent) noexcept:
+MetalClawReader::MetalClawReader(const uint8_t *buff, std::size_t buffLen, int unionIdx, MetalClawReader *parent) noexcept:
 	m_fieldPresence(buff, buffLen),
 	m_unionIdx(unionIdx),
 	m_buffLen(buffLen),
diff --git a/deps/ox/src/ox/mc/read.hpp b/deps/ox/src/ox/mc/read.hpp
index d84e6d3cb..433d19c6e 100644
--- a/deps/ox/src/ox/mc/read.hpp
+++ b/deps/ox/src/ox/mc/read.hpp
@@ -31,11 +31,11 @@ class MetalClawReader {
 		int m_unionIdx = -1;
 		std::size_t m_buffIt = 0;
 		std::size_t m_buffLen = 0;
-		uint8_t *m_buff = nullptr;
+		const uint8_t *m_buff = nullptr;
 		MetalClawReader *m_parent = nullptr;
 
 	public:
-		MetalClawReader(uint8_t *buff, std::size_t buffLen, int unionIdx = -1, MetalClawReader *parent = nullptr) noexcept;
+		MetalClawReader(const uint8_t *buff, std::size_t buffLen, int unionIdx = -1, MetalClawReader *parent = nullptr) noexcept;
 
 		~MetalClawReader() noexcept;
 
@@ -273,7 +273,7 @@ void MetalClawReader::setTypeInfo(const char*, int fields) {
 }
 
 template<typename T>
-Error readMC(uint8_t *buff, std::size_t buffLen, T *val) {
+Error readMC(const uint8_t *buff, std::size_t buffLen, T *val) {
 	MetalClawReader reader(buff, buffLen);
 	return model(&reader, val);
 }