diff --git a/src/osgPlugins/txp/trpage_io.h b/src/osgPlugins/txp/trpage_io.h
index 44e19e39e..31eef9725 100644
--- a/src/osgPlugins/txp/trpage_io.h
+++ b/src/osgPlugins/txp/trpage_io.h
@@ -579,7 +579,7 @@ public:
     trpgrAppFile(trpgEndian,const char *);
     virtual ~trpgrAppFile(void);
     virtual bool Read(trpgMemReadBuffer *,int32 offset);
-    virtual bool Read(char *data,int32 offset,int32 dataSize);
+    virtual bool Read(char *data,int32 offset,uint32 dataSize);
 
     bool isValid(void) const;
 protected:
diff --git a/src/osgPlugins/txp/trpage_readbuf.cpp b/src/osgPlugins/txp/trpage_readbuf.cpp
index 1e5760204..f68467535 100644
--- a/src/osgPlugins/txp/trpage_readbuf.cpp
+++ b/src/osgPlugins/txp/trpage_readbuf.cpp
@@ -469,7 +469,7 @@ bool trpgrAppFile::Read(trpgMemReadBuffer *buf,int32 offset)
 
     // Byteswap if necessary
     if (ness != cpuNess)
-        trpg_byteswap_int(len);
+        len = trpg_byteswap_int(len);
 
     if (len < 0) {
         valid = false;
@@ -496,7 +496,7 @@ bool trpgrAppFile::Read(trpgMemReadBuffer *buf,int32 offset)
     check the length against the size of the memory
     passed into dataSize.
  */
-bool trpgrAppFile::Read(char *data,int32 offset,int32 dataSize)
+bool trpgrAppFile::Read(char *data,int32 offset,uint32 dataSize)
 {
     if (!valid)  return false;
 
@@ -516,7 +516,7 @@ bool trpgrAppFile::Read(char *data,int32 offset,int32 dataSize)
 
     // Byteswap if necessary
     if (ness != cpuNess)
-        trpg_byteswap_int(len);
+        len = trpg_byteswap_int(len);
 
     if (len < 0) {
         valid = false;