diff --git a/include/dos_system.h b/include/dos_system.h
index 68380b59..14593882 100644
--- a/include/dos_system.h
+++ b/include/dos_system.h
@@ -16,6 +16,8 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
+/* $Id: dos_system.h,v 1.14 2003-08-13 14:46:15 qbix79 Exp $ */
+
 #ifndef DOSSYSTEM_H_
 #define DOSSYSTEM_H_
 
@@ -140,7 +142,7 @@ private:
 	bool		IsCachedIn			(CFileInfo* dir);
 	CFileInfo*	FindDirInfo			(const char* path, char* expandedPath);
 	bool		RemoveSpaces		(char* str);
-	bool		OpenDir				(CFileInfo* dir, char* path, Bit16u& id);
+	bool		OpenDir				(CFileInfo* dir, const char* path, Bit16u& id);
 	void		CreateEntry			(CFileInfo* dir, const char* name);
 	Bit16u		GetFreeID			(CFileInfo* dir);
 	void		Clear				(void);
diff --git a/src/dos/drive_cache.cpp b/src/dos/drive_cache.cpp
index 3a978309..0ff1ccd1 100644
--- a/src/dos/drive_cache.cpp
+++ b/src/dos/drive_cache.cpp
@@ -17,7 +17,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: drive_cache.cpp,v 1.22 2003-08-06 14:46:58 qbix79 Exp $ */
+/* $Id: drive_cache.cpp,v 1.23 2003-08-13 14:45:31 qbix79 Exp $ */
 
 #include "drives.h"
 #include "dos_inc.h"
@@ -521,21 +521,23 @@ bool DOS_Drive_Cache::OpenDir(const char* path, Bit16u& id)
 	return false;
 };	
 
-bool DOS_Drive_Cache::OpenDir(CFileInfo* dir, char* expand, Bit16u& id)
+bool DOS_Drive_Cache::OpenDir(CFileInfo* dir, const char* expand, Bit16u& id)
 {
 	id = GetFreeID(dir);
 	dirSearch[id] = dir;
+	char expandcopy [CROSS_LEN];
+	strcpy(expandcopy,expand);   
 	// Add "/"
 	char end[2]={CROSS_FILESPLIT,0};
-	if (expand[strlen(expand)-1]!=CROSS_FILESPLIT) strcat(expand,end);
+	if (expandcopy[strlen(expandcopy)-1]!=CROSS_FILESPLIT) strcat(expandcopy,end);
 	// open dir
 	if (dirSearch[id]) {
 		// open dir
-		DIR* dirp = opendir(expand);
+		DIR* dirp = opendir(expandcopy);
 		if (dirp) { 
 			// Reset it..
 			closedir(dirp);
-			strcpy(dirPath,expand);
+			strcpy(dirPath,expandcopy);
 			free[id] = false;
 			return true;
 		}