diff --git a/rdf/base/src/nsFixedSizeAllocator.h b/rdf/base/src/nsFixedSizeAllocator.h
index f4e9d8d9213e..8045782e19da 100644
--- a/rdf/base/src/nsFixedSizeAllocator.h
+++ b/rdf/base/src/nsFixedSizeAllocator.h
@@ -45,6 +45,10 @@ protected:
     PLArenaPool mPool;
 
     struct Bucket;
+    struct FreeEntry;
+  
+    friend struct Bucket;
+    friend struct FreeEntry;
 
     struct FreeEntry {
         Bucket*    mBucket;