4 files changed, 4 insertions, 4 deletions
diff --git a/src/net/eathena/messagein.cpp b/src/net/eathena/messagein.cpp
index fa19465a3..3a71e0c76 100644
--- a/src/net/eathena/messagein.cpp
+++ b/src/net/eathena/messagein.cpp
@@ -49,7 +49,7 @@ void MessageIn::postInit(const char *const str)
     readInt16(str);
 }
 
-uint16_t MessageIn::readId()
+uint16_t MessageIn::readId() const
 {
     int16_t value = -1;
     if (mPos + 2 <= mLength)
diff --git a/src/net/eathena/messagein.h b/src/net/eathena/messagein.h
index 218c3c3fb..da5f57d7d 100644
--- a/src/net/eathena/messagein.h
+++ b/src/net/eathena/messagein.h
@@ -57,7 +57,7 @@ class MessageIn final : public Net::MessageIn
 
         BeingId readBeingId(const char *const str) override final;
 
-        uint16_t readId();
+        uint16_t readId() const;
 };
 
 }  // namespace EAthena
diff --git a/src/net/eathena/messageout.cpp b/src/net/eathena/messageout.cpp
index 83be120e5..a20d924c9 100644
--- a/src/net/eathena/messageout.cpp
+++ b/src/net/eathena/messageout.cpp
@@ -43,7 +43,7 @@ MessageOut::MessageOut(const int16_t id) :
     mData = mNetwork->mOutBuffer + CAST_SIZE(mNetwork->mOutSize);
 }
 
-void MessageOut::expand(const size_t bytes)
+void MessageOut::expand(const size_t bytes) const
 {
     mNetwork->mOutSize += CAST_U32(bytes);
     PacketCounters::incOutBytes(CAST_S32(bytes));
diff --git a/src/net/eathena/messageout.h b/src/net/eathena/messageout.h
index 971a4be97..83f9fbe7f 100644
--- a/src/net/eathena/messageout.h
+++ b/src/net/eathena/messageout.h
@@ -70,7 +70,7 @@ class MessageOut final : public Net::MessageOut
         { mPos = 0; }
 
     private:
-        void expand(const size_t size) override final;
+        void expand(const size_t size) const override final;
 
         Network *mNetwork;
 };