diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 331d5e59e01..fe539924d25 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2003-05-01  Paolo Carlini  <pcarlini@unitus.it>
+
+	* include/bits/streambuf.tcc (__copy_streambufs): Adjust the
+	type of __avail to ptrdiff_t to avoid signed-unsigned warning.
+
 2003-05-01  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* testsuite/abi_check.cc (check_version): Update known versions.
diff --git a/libstdc++-v3/include/bits/streambuf.tcc b/libstdc++-v3/include/bits/streambuf.tcc
index e4aab0ccc31..08b24c81d36 100644
--- a/libstdc++-v3/include/bits/streambuf.tcc
+++ b/libstdc++-v3/include/bits/streambuf.tcc
@@ -192,8 +192,8 @@ namespace std
 	  for (;;)
   	    {
 	      streamsize __xtrct;
-	      const size_t __avail = __sbin->_M_in_end
-		                     - __sbin->_M_in_cur;
+	      const ptrdiff_t __avail = __sbin->_M_in_end
+		                        - __sbin->_M_in_cur;
  	      if (__avail)
 		{
 		  __xtrct = __sbout->sputn(__sbin->_M_in_cur, __avail);