diff --git a/src/common/fileback.cpp b/src/common/fileback.cpp
index a0cbc707d8..06d32ae99e 100644
--- a/src/common/fileback.cpp
+++ b/src/common/fileback.cpp
@@ -83,7 +83,7 @@ wxBackingFileImpl::wxBackingFileImpl(wxInputStream *stream,
     wxFileOffset len = m_stream->GetLength();
 
     if (len >= 0 && len + size_t(1) < m_bufsize)
-        m_bufsize = len + 1;
+        m_bufsize = size_t(len + 1);
 
     if (m_bufsize)
         m_buf = new char[m_bufsize];
diff --git a/src/common/fs_filter.cpp b/src/common/fs_filter.cpp
index bf466d5af3..4a96eed7f1 100644
--- a/src/common/fs_filter.cpp
+++ b/src/common/fs_filter.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        fs_filter.cpp
+// Name:        src/common/fs_filter.cpp
 // Purpose:     wxFilter file system handler
 // Author:      Mike Wetherell
 // Copyright:   (c) 2006 Mike Wetherell
@@ -10,7 +10,7 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #if wxUSE_FILESYSTEM
@@ -41,7 +41,7 @@ wxFSFile* wxFilterFSHandler::OpenFile(
     wxString right = GetRightLocation(location);
     if (!right.empty())
         return NULL;
-    
+
     wxString protocol = GetProtocol(location);
     const wxFilterClassFactory *factory = wxFilterClassFactory::Find(protocol);
     if (!factory)
@@ -59,8 +59,8 @@ wxFSFile* wxFilterFSHandler::OpenFile(
     wxInputStreamPtr stream(factory->NewStream(leftStream.get()));
 
     // The way compressed streams are supposed to be served is e.g.:
-    //  Content-type: application/postscript 
-    //  Content-encoding: gzip 
+    //  Content-type: application/postscript
+    //  Content-encoding: gzip
     // So the mime type should be just the mime type of the lhs. However check
     // whether the mime type is that of this compression format (e.g.
     // application/gzip). If so pop any extension and try GetMimeTypeFromExt,
@@ -79,7 +79,7 @@ wxFSFile* wxFilterFSHandler::OpenFile(
                        );
 }
 
-wxString wxFilterFSHandler::FindFirst(const wxString& spec, int flags)
+wxString wxFilterFSHandler::FindFirst(const wxString& WXUNUSED(spec), int WXUNUSED(flags))
 {
     return wxEmptyString;
 }