diff --git a/common/rfb/SConnection.cxx b/common/rfb/SConnection.cxx
index 9bff4cd..bfff70c 100644
--- a/common/rfb/SConnection.cxx
+++ b/common/rfb/SConnection.cxx
@@ -270,7 +270,7 @@
   os->flush();
 }
 
-void SConnection::setEncodings(int nEncodings, rdr::S32* encodings)
+void SConnection::setEncodings(int nEncodings, const rdr::S32* encodings)
 {
   int i;
 
diff --git a/common/rfb/SConnection.h b/common/rfb/SConnection.h
index f154218..ef1de2b 100644
--- a/common/rfb/SConnection.h
+++ b/common/rfb/SConnection.h
@@ -71,7 +71,7 @@
 
     // Overridden from SMsgHandler
 
-    virtual void setEncodings(int nEncodings, rdr::S32* encodings);
+    virtual void setEncodings(int nEncodings, const rdr::S32* encodings);
 
 
     // Methods to be overridden in a derived class
diff --git a/common/rfb/SMsgHandler.cxx b/common/rfb/SMsgHandler.cxx
index d4046b1..388b21f 100644
--- a/common/rfb/SMsgHandler.cxx
+++ b/common/rfb/SMsgHandler.cxx
@@ -39,7 +39,7 @@
   cp.setPF(pf);
 }
 
-void SMsgHandler::setEncodings(int nEncodings, rdr::S32* encodings)
+void SMsgHandler::setEncodings(int nEncodings, const rdr::S32* encodings)
 {
   bool firstFence, firstContinuousUpdates;
 
diff --git a/common/rfb/SMsgHandler.h b/common/rfb/SMsgHandler.h
index c21cf52..74509e0 100644
--- a/common/rfb/SMsgHandler.h
+++ b/common/rfb/SMsgHandler.h
@@ -46,7 +46,7 @@
     virtual void clientInit(bool shared);
 
     virtual void setPixelFormat(const PixelFormat& pf);
-    virtual void setEncodings(int nEncodings, rdr::S32* encodings);
+    virtual void setEncodings(int nEncodings, const rdr::S32* encodings);
     virtual void framebufferUpdateRequest(const Rect& r, bool incremental) = 0;
     virtual void setDesktopSize(int fb_width, int fb_height,
                                 const ScreenSet& layout) = 0;