diff --git a/include/dos_inc.h b/include/dos_inc.h
index 0100c2c3..860f84c5 100644
--- a/include/dos_inc.h
+++ b/include/dos_inc.h
@@ -349,8 +349,8 @@ public:
 	#pragma pack(1)
 	#endif
 	struct sDIB {		
-		Bit8u	stuff1[22];			// -0x18 some stuff, hopefully never used....
-		Bit16u	firstMCB;			// -0x2  first memory control block
+		Bit8u	stuff1[20];			// -0x18 some stuff, hopefully never used....
+		RealPt	firstMCB;			// -0x04  first memory control block
 		RealPt	firstDPB;			//  0x00 first drive parameter block
 		RealPt	firstFileTable;		//  0x04 first system file table
 		RealPt	activeClock;		//  0x08 active clock device header
diff --git a/src/dos/dos_classes.cpp b/src/dos/dos_classes.cpp
index 9fd8e8af..9f1e25b9 100644
--- a/src/dos/dos_classes.cpp
+++ b/src/dos/dos_classes.cpp
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: dos_classes.cpp,v 1.33 2004-01-10 14:03:34 qbix79 Exp $ */
+/* $Id: dos_classes.cpp,v 1.34 2004-02-03 14:54:36 finsterr Exp $ */
 
 #include <string.h>
 #include <stdlib.h>
@@ -68,7 +68,7 @@ void DOS_InfoBlock::SetLocation(Bit16u segment)
 
 void DOS_InfoBlock::SetFirstMCB(Bit16u _firstmcb)
 {
-	sSave(sDIB,firstMCB,_firstmcb);
+	sSave(sDIB,firstMCB,RealMake(_firstmcb,0));
 }
 
 void DOS_InfoBlock::SetfirstFileTable(RealPt _first_table){