diff --git a/include/binder/IMemory.h b/include/binder/IMemory.h
index ae042cb..74d2cc7 100644
--- a/include/binder/IMemory.h
+++ b/include/binder/IMemory.h
@@ -36,8 +36,7 @@
 
     // flags returned by getFlags()
     enum {
-        READ_ONLY   = 0x00000001,
-        MAP_ONCE    = 0x00000002
+        READ_ONLY   = 0x00000001
     };
 
     virtual int         getHeapID() const = 0;
diff --git a/include/binder/MemoryHeapBase.h b/include/binder/MemoryHeapBase.h
index d793c24..2f2e31b 100644
--- a/include/binder/MemoryHeapBase.h
+++ b/include/binder/MemoryHeapBase.h
@@ -32,7 +32,6 @@
 public:
     enum {
         READ_ONLY = IMemoryHeap::READ_ONLY,
-        MAP_ONCE = IMemoryHeap::MAP_ONCE,
         // memory won't be mapped locally, but will be mapped in the remote
         // process.
         DONT_MAP_LOCALLY = 0x00000100,
diff --git a/include/binder/MemoryHeapPmem.h b/include/binder/MemoryHeapPmem.h
index aac164f..e1660c4 100644
--- a/include/binder/MemoryHeapPmem.h
+++ b/include/binder/MemoryHeapPmem.h
@@ -46,8 +46,7 @@
         sp<MemoryHeapPmem>  mClientHeap;
     };
     
-    MemoryHeapPmem(const sp<MemoryHeapBase>& pmemHeap,
-                uint32_t flags = IMemoryHeap::MAP_ONCE);
+    MemoryHeapPmem(const sp<MemoryHeapBase>& pmemHeap, uint32_t flags = 0);
     ~MemoryHeapPmem();
 
     /* HeapInterface additions */
diff --git a/libs/binder/IMemory.cpp b/libs/binder/IMemory.cpp
index 6c1d225..bc8c412 100644
--- a/libs/binder/IMemory.cpp
+++ b/libs/binder/IMemory.cpp
@@ -46,7 +46,6 @@
     virtual void binderDied(const wp<IBinder>& who);
 
     sp<IMemoryHeap> find_heap(const sp<IBinder>& binder); 
-    void pin_heap(const sp<IBinder>& binder); 
     void free_heap(const sp<IBinder>& binder); 
     sp<IMemoryHeap> get_heap(const sp<IBinder>& binder);
     void dump_heaps();
@@ -100,13 +99,9 @@
     static inline void dump_heaps() {
         gHeapCache->dump_heaps();       
     }
-    void inline pin_heap() const {
-        gHeapCache->pin_heap(const_cast<BpMemoryHeap*>(this)->asBinder());
-    }
 
     void assertMapped() const;
     void assertReallyMapped() const;
-    void pinHeap() const;
 
     mutable volatile int32_t mHeapId;
     mutable void*       mBase;
@@ -320,11 +315,6 @@
                         asBinder().get(), size, fd, strerror(errno));
                 close(fd);
             } else {
-                if (flags & MAP_ONCE) {
-                    //LOGD("pinning heap (binder=%p, size=%d, fd=%d",
-                    //        asBinder().get(), size, fd);
-                    pin_heap();
-                }
                 mSize = size;
                 mFlags = flags;
                 android_atomic_write(fd, &mHeapId);
@@ -421,19 +411,6 @@
     }
 }
 
-void HeapCache::pin_heap(const sp<IBinder>& binder) 
-{
-    Mutex::Autolock _l(mHeapCacheLock);
-    ssize_t i = mHeapCache.indexOfKey(binder);
-    if (i>=0) {
-        heap_info_t& info(mHeapCache.editValueAt(i));
-        android_atomic_inc(&info.count);
-        binder->linkToDeath(this);
-    } else {
-        LOGE("pin_heap binder=%p not found!!!", binder.get());
-    }    
-}
-
 void HeapCache::free_heap(const sp<IBinder>& binder)  {
     free_heap( wp<IBinder>(binder) );
 }