diff --git a/src/osgPlugins/zip/ReaderWriterZIP.cpp b/src/osgPlugins/zip/ReaderWriterZIP.cpp
index 06a2f2887..d49c20d2e 100644
--- a/src/osgPlugins/zip/ReaderWriterZIP.cpp
+++ b/src/osgPlugins/zip/ReaderWriterZIP.cpp
@@ -20,7 +20,7 @@ class ReaderWriterZIP : public osgDB::ReaderWriter
         virtual const char* className() const { return "ZIP Database Reader/Writer"; }
 
 
-        virtual ReadResult openArchive(const std::string& file,ArchiveStatus status, unsigned int indexBlockSize = 4096, const Options* options = NULL) const
+        virtual ReadResult openArchive(const std::string& file,ArchiveStatus /*status*/, unsigned int /*indexBlockSize*/ = 4096, const Options* options = NULL) const
         {
 
             std::string ext = osgDB::getLowerCaseFileExtension(file);
diff --git a/src/osgPlugins/zip/ZipArchive.cpp b/src/osgPlugins/zip/ZipArchive.cpp
index ae5a8df2e..44f249f66 100644
--- a/src/osgPlugins/zip/ZipArchive.cpp
+++ b/src/osgPlugins/zip/ZipArchive.cpp
@@ -111,7 +111,7 @@ bool ZipArchive::getFileNames(osgDB::Archive::FileNameList& fileNameList) const
     }
 }
 
-bool ZipArchive::open(const std::string& file, ArchiveStatus status, const osgDB::ReaderWriter::Options* options)
+bool ZipArchive::open(const std::string& file, ArchiveStatus /*status*/, const osgDB::ReaderWriter::Options* options)
 {
     if ( !_zipLoaded )
     {
@@ -371,7 +371,7 @@ osgDB::ReaderWriter::WriteResult ZipArchive::writeShader(const osg::Shader& /*sh
 }
 
 
-osgDB::ReaderWriter* ZipArchive::ReadFromZipEntry(const ZIPENTRY* ze, const osgDB::ReaderWriter::Options* options, std::stringstream& buffer) const
+osgDB::ReaderWriter* ZipArchive::ReadFromZipEntry(const ZIPENTRY* ze, const osgDB::ReaderWriter::Options* /*options*/, std::stringstream& buffer) const
 {
     if (ze != 0)
     {