diff --git a/src/fsfw/cfdp/handler/DestHandler.cpp b/src/fsfw/cfdp/handler/DestHandler.cpp
index 999cb155..4bb1cf5c 100644
--- a/src/fsfw/cfdp/handler/DestHandler.cpp
+++ b/src/fsfw/cfdp/handler/DestHandler.cpp
@@ -146,7 +146,7 @@ ReturnValue_t cfdp::DestHandler::handleMetadataPdu(const PacketInfo& info) {
     return handleMetadataParseError(result, constAccessorPair.second.data(),
                                     constAccessorPair.second.size());
   }
-  return startTransaction(reader, metadataInfo);
+  return startTransaction(reader);
 }
 
 ReturnValue_t cfdp::DestHandler::handleFileDataPdu(const cfdp::PacketInfo& info) {
@@ -274,8 +274,7 @@ ReturnValue_t cfdp::DestHandler::handleMetadataParseError(ReturnValue_t result,
   return returnvalue::FAILED;
 }
 
-ReturnValue_t cfdp::DestHandler::startTransaction(MetadataPduReader& reader,
-                                                  MetadataGenericInfo& info) {
+ReturnValue_t cfdp::DestHandler::startTransaction(const MetadataPduReader& reader) {
   if (fsmRes.state != CfdpState::IDLE) {
     // According to standard, discard metadata PDU if we are busy
     return OK;
@@ -344,6 +343,7 @@ ReturnValue_t cfdp::DestHandler::startTransaction(MetadataPduReader& reader,
   } else if (reader.getTransmissionMode() == TransmissionMode::ACKNOWLEDGED) {
     fsmRes.state = CfdpState::BUSY_CLASS_2_ACKED;
   }
+  auto& info = reader.getGenericInfo();
   transactionParams.checksumType = info.getChecksumType();
   transactionParams.closureRequested = info.isClosureRequested();
   reader.fillConfig(transactionParams.pduConf);
diff --git a/src/fsfw/cfdp/handler/DestHandler.h b/src/fsfw/cfdp/handler/DestHandler.h
index 0940ab70..de1104c8 100644
--- a/src/fsfw/cfdp/handler/DestHandler.h
+++ b/src/fsfw/cfdp/handler/DestHandler.h
@@ -153,7 +153,7 @@ class DestHandler {
   cfdp::FsfwParams fsfwParams;
   FsmResult fsmRes;
 
-  ReturnValue_t startTransaction(MetadataPduReader& reader, MetadataGenericInfo& info);
+  ReturnValue_t startTransaction(const MetadataPduReader& reader);
   ReturnValue_t handleMetadataPdu(const PacketInfo& info);
   ReturnValue_t handleFileDataPdu(const PacketInfo& info);
   ReturnValue_t handleEofPdu(const PacketInfo& info);
diff --git a/src/fsfw/cfdp/pdu/MetadataGenericInfo.cpp b/src/fsfw/cfdp/pdu/MetadataGenericInfo.cpp
index efbe620e..f3b1c751 100644
--- a/src/fsfw/cfdp/pdu/MetadataGenericInfo.cpp
+++ b/src/fsfw/cfdp/pdu/MetadataGenericInfo.cpp
@@ -21,7 +21,7 @@ void MetadataGenericInfo::setClosureRequested(bool closureRequested_) {
   closureRequested = closureRequested_;
 }
 
-cfdp::Fss& MetadataGenericInfo::getFileSize() { return fileSize; }
+const cfdp::Fss& MetadataGenericInfo::getFileSize() const { return fileSize; }
 
 size_t MetadataGenericInfo::getSerializedSize(bool fssLarge) {
   // 1 byte + minimal FSS 4 bytes
@@ -31,3 +31,5 @@ size_t MetadataGenericInfo::getSerializedSize(bool fssLarge) {
   }
   return size;
 }
+
+cfdp::Fss& MetadataGenericInfo::getMutFileSize() { return fileSize; }
diff --git a/src/fsfw/cfdp/pdu/MetadataGenericInfo.h b/src/fsfw/cfdp/pdu/MetadataGenericInfo.h
index 59caabb3..73a54972 100644
--- a/src/fsfw/cfdp/pdu/MetadataGenericInfo.h
+++ b/src/fsfw/cfdp/pdu/MetadataGenericInfo.h
@@ -22,7 +22,9 @@ class MetadataGenericInfo {
   [[nodiscard]] bool isClosureRequested() const;
   void setClosureRequested(bool closureRequested = false);
 
-  cfdp::Fss& getFileSize();
+  [[nodiscard]] const cfdp::Fss& getFileSize() const;
+
+  cfdp::Fss& getMutFileSize();
 
  private:
   bool closureRequested = false;
diff --git a/src/fsfw/cfdp/pdu/MetadataPduReader.cpp b/src/fsfw/cfdp/pdu/MetadataPduReader.cpp
index 69a7d4aa..e6160ce8 100644
--- a/src/fsfw/cfdp/pdu/MetadataPduReader.cpp
+++ b/src/fsfw/cfdp/pdu/MetadataPduReader.cpp
@@ -25,7 +25,7 @@ ReturnValue_t MetadataPduReader::parseData() {
   remSize -= 1;
   buf += 1;
   auto endianness = getEndianness();
-  result = info.getFileSize().deSerialize(&buf, &remSize, endianness);
+  result = info.getMutFileSize().deSerialize(&buf, &remSize, endianness);
   if (result != returnvalue::OK) {
     return result;
   }
@@ -63,3 +63,5 @@ size_t MetadataPduReader::getNumberOfParsedOptions() const { return parsedOption
 const cfdp::StringLv& MetadataPduReader::getSourceFileName() const { return srcFileName; }
 
 const cfdp::StringLv& MetadataPduReader::getDestFileName() const { return destFileName; }
+
+const MetadataGenericInfo& MetadataPduReader::getGenericInfo() const { return info; }
diff --git a/src/fsfw/cfdp/pdu/MetadataPduReader.h b/src/fsfw/cfdp/pdu/MetadataPduReader.h
index e619d4f5..a409928e 100644
--- a/src/fsfw/cfdp/pdu/MetadataPduReader.h
+++ b/src/fsfw/cfdp/pdu/MetadataPduReader.h
@@ -11,6 +11,7 @@ class MetadataPduReader : public FileDirectiveReader {
 
   ReturnValue_t parseData() override;
 
+  [[nodiscard]] const MetadataGenericInfo& getGenericInfo() const;
   [[nodiscard]] const cfdp::StringLv& getSourceFileName() const;
   [[nodiscard]] const cfdp::StringLv& getDestFileName() const;