diff --git a/engine/common/soundlib/libmpg/libmpg.c b/engine/common/soundlib/libmpg/libmpg.c
index 3397dc0d..05127440 100644
--- a/engine/common/soundlib/libmpg/libmpg.c
+++ b/engine/common/soundlib/libmpg/libmpg.c
@@ -87,7 +87,7 @@ int open_mpeg_stream( void *mpg, void *file, pfread f_read, pfseek f_seek, wavin
 
 	if( !mh || !sc ) return 0;
 
-	ret = mpg123_replace_reader_handle( mh, (void *)f_read, (void *)f_seek, NULL );
+	ret = mpg123_replace_reader_handle( mh, f_read, f_seek, NULL );
 	if( ret != MPG123_OK )
 		return 0;
 
diff --git a/engine/common/soundlib/libmpg/libmpg.h b/engine/common/soundlib/libmpg/libmpg.h
index 34f6e23b..da12c1c7 100644
--- a/engine/common/soundlib/libmpg/libmpg.h
+++ b/engine/common/soundlib/libmpg/libmpg.h
@@ -34,9 +34,15 @@ typedef struct
 	int	playtime;		// stream size in milliseconds
 } wavinfo_t;
 
+#ifdef _MSC_VER // a1ba: MSVC6 don't have ssize_t
+typedef long		mpg_ssize_t;
+#else
+typedef ssize_t		mpg_ssize_t;
+#endif
+
 // custom stdio
-typedef long (*pfread)( void *handle, void *buf, size_t count );
-typedef long (*pfseek)( void *handle, long offset, int whence );
+typedef mpg_ssize_t (*pfread)( void *handle, void *buf, size_t count );
+typedef fs_offset_t (*pfseek)( void *handle, fs_offset_t offset, int whence );
 
 extern void *create_decoder( int *error );
 extern int feed_mpeg_header( void *mpg, const byte *data, long bufsize, long streamsize, wavinfo_t *sc );
diff --git a/engine/common/soundlib/libmpg/mpg123.h b/engine/common/soundlib/libmpg/mpg123.h
index 6db8b3f7..0f9a8857 100644
--- a/engine/common/soundlib/libmpg/mpg123.h
+++ b/engine/common/soundlib/libmpg/mpg123.h
@@ -32,6 +32,7 @@ typedef struct mpg123_handle_s	mpg123_handle_t;
 #include <stdlib.h>
 #include "fmt123.h"
 #include STDINT_H
+#include "xash3d_types.h"
 
 #ifndef FALSE
 #define FALSE 0
@@ -50,7 +51,7 @@ typedef unsigned char	byte;
 typedef unsigned short	word;
 typedef unsigned long	ulong;
 typedef unsigned int	uint;
-typedef long		mpg_off_t;
+typedef fs_offset_t	mpg_off_t;
 
 #ifdef _MSC_VER // a1ba: MSVC6 don't have ssize_t
 typedef long		mpg_ssize_t;
diff --git a/engine/common/soundlib/snd_mp3.c b/engine/common/soundlib/snd_mp3.c
index b7ab1380..e1814c48 100644
--- a/engine/common/soundlib/snd_mp3.c
+++ b/engine/common/soundlib/snd_mp3.c
@@ -291,14 +291,14 @@ qboolean Sound_LoadMPG( const char *name, const byte *buffer, fs_offset_t filesi
 	return true;
 }
 
-/*
-=================
-FS_SeekEx
-=================
-*/
-static fs_offset_t FS_SeekEx( file_t *file, fs_offset_t offset, int whence )
+static fs_offset_t FS_SeekMpg( void *file, fs_offset_t offset, int whence )
 {
-	return FS_Seek( file, offset, whence ) == -1 ? -1 : FS_Tell( file );
+	return g_fsapi.Seek((file_t *)file, offset, whence ) == -1 ? -1 : g_fsapi.Tell((file_t *)file );
+}
+
+static mpg_ssize_t FS_ReadMpg( void *file, void *buf, size_t count )
+{
+	return g_fsapi.Read((file_t *)file, buf, count );
 }
 
 /*
@@ -334,7 +334,7 @@ stream_t *Stream_OpenMPG( const char *filename )
 	if( ret ) Con_DPrintf( S_ERROR "%s\n", get_error( mpeg ));
 
 	// trying to open stream and read header
-	if( !open_mpeg_stream( mpeg, file, (void*)FS_Read, (void*)FS_SeekEx, &sc ))
+	if( !open_mpeg_stream( mpeg, file, FS_ReadMpg, FS_SeekMpg, &sc ))
 	{
 		Con_DPrintf( S_ERROR "Stream_OpenMPG: failed to load (%s): %s\n", filename, get_error( mpeg ));
 		close_decoder( mpeg );