diff --git a/btree_standardVFS.cpp b/btree_standardVFS.cpp
index fc9814a..c6ee6c4 100644
--- a/btree_standardVFS.cpp
+++ b/btree_standardVFS.cpp
@@ -1,8 +1,8 @@
 #include <stdio.h>
+#include <unistd.h>
 #include "btree_vfs.h"
 #include "btree_standardVFS.h"
 
-
 StandardVFS::StandardVFS(void) { 
   dataFile = NULL;
   openFile = false;
@@ -24,8 +24,8 @@
 } // StandardVFS::fCreate
 
 bool  
-StandardVFS::fExist(const char *) { 
-  return false; 
+StandardVFS::fExist(const char * filename) { 
+  return (access(filename, F_OK) == 0);
 } // StandardVFS::fExist
 
 bool