diff --git a/db/mongommf.h b/db/mongommf.h
index 5da46fc7c87..b347e4ff259 100644
--- a/db/mongommf.h
+++ b/db/mongommf.h
@@ -27,6 +27,9 @@ namespace mongo {
         not this.
     */
     class MongoMMF : private MemoryMappedFile {
+    protected:
+        virtual void* viewForFlushing() { return _view_write; }
+
     public:
         MongoMMF();
         virtual ~MongoMMF();
diff --git a/util/mmap.h b/util/mmap.h
index 74ef8649c44..c09dfce281c 100644
--- a/util/mmap.h
+++ b/util/mmap.h
@@ -135,6 +135,13 @@ namespace mongo {
     };
 
     class MemoryMappedFile : public MongoFile {
+    protected:
+        virtual void* viewForFlushing() { 
+            if( views.size() == 0 )
+                return 0;
+            assert( views.size() == 1 );
+            return views[0];
+        }
     public:
         MemoryMappedFile();
 
@@ -187,7 +194,7 @@ namespace mongo {
         HANDLE maphandle;
         vector<void *> views;
         unsigned long long len;
-
+        
 #ifdef _WIN32
         boost::shared_ptr<mutex> _flushMutex;
         void clearWritableBits(void *privateView);
diff --git a/util/mmap_posix.cpp b/util/mmap_posix.cpp
index 309d0420928..5b213134f24 100644
--- a/util/mmap_posix.cpp
+++ b/util/mmap_posix.cpp
@@ -155,7 +155,7 @@ namespace mongo {
     void MemoryMappedFile::flush(bool sync) {
         if ( views.empty() || fd == 0 )
             return;
-        if ( msync(views[0], len, sync ? MS_SYNC : MS_ASYNC) )
+        if ( msync(viewForFlushing(), len, sync ? MS_SYNC : MS_ASYNC) )
             problem() << "msync " << errnoWithDescription() << endl;
     }
 
@@ -178,7 +178,7 @@ namespace mongo {
     };
 
     MemoryMappedFile::Flushable * MemoryMappedFile::prepareFlush() {
-        return new PosixFlushable( views.empty() ? 0 : views[0] , fd , len );
+        return new PosixFlushable( viewForFlushing() , fd , len );
     }
 
     void MemoryMappedFile::_lock() {
diff --git a/util/mmap_win.cpp b/util/mmap_win.cpp
index 0b0b834becd..13369bad30b 100644
--- a/util/mmap_win.cpp
+++ b/util/mmap_win.cpp
@@ -183,13 +183,13 @@ namespace mongo {
     void MemoryMappedFile::flush(bool sync) {
         uassert(13056, "Async flushing not supported on windows", sync);
         if( !views.empty() ) {
-            WindowsFlushable f( views[0] , fd , filename() , _flushMutex);
+            WindowsFlushable f( viewForFlushing() , fd , filename() , _flushMutex);
             f.flush();
         }
     }
 
     MemoryMappedFile::Flushable * MemoryMappedFile::prepareFlush() {
-        return new WindowsFlushable( views.empty() ? 0 : views[0] , fd , filename() , _flushMutex );
+        return new WindowsFlushable( viewForFlushing() , fd , filename() , _flushMutex );
     }
     void MemoryMappedFile::_lock() {}
     void MemoryMappedFile::_unlock() {}