diff --git a/include/boost/iostreams/filter/bzip2.hpp b/include/boost/iostreams/filter/bzip2.hpp
index d18573b..4dc7419 100755
--- a/include/boost/iostreams/filter/bzip2.hpp
+++ b/include/boost/iostreams/filter/bzip2.hpp
@@ -45,12 +45,12 @@ namespace bzip2 {
 
                     // Typedefs.
 
-extern "C" {
+//extern "C" {
 
 typedef void* (*alloc_func)(void*, int, int);
 typedef void (*free_func)(void*, void*);
 
-} // End extern "C".
+//} // End extern "C".
 
                     // Status codes
 
diff --git a/include/boost/iostreams/filter/zlib.hpp b/include/boost/iostreams/filter/zlib.hpp
index 6b46c0b..5a28b6c 100755
--- a/include/boost/iostreams/filter/zlib.hpp
+++ b/include/boost/iostreams/filter/zlib.hpp
@@ -46,12 +46,12 @@ typedef unsigned int uint;
 typedef unsigned char byte;
 typedef unsigned long ulong;
 
-extern "C" {
+//extern "C" {
 
 typedef void* (*alloc_func)(void*, zlib::uint, zlib::uint);
 typedef void (*free_func)(void*, void*);
 
-} // End extern "C".
+//} // End extern "C".
 
                     // Compression levels