diff --git a/src/osdc/Filer.h b/src/osdc/Filer.h
index 237f618458c..bd09a8eaecd 100644
--- a/src/osdc/Filer.h
+++ b/src/osdc/Filer.h
@@ -143,7 +143,7 @@ class Filer {
       }
     }
 
-    void assemble_result(bufferlist& bl) {
+    void assemble_result(bufferlist& bl, bool zero_tail) {
       // go backwards, so that we can efficiently discard zeros
       map<uint64_t,pair<bufferlist,uint64_t> >::reverse_iterator p = partial.rbegin();
       if (p == partial.rend())
@@ -157,7 +157,7 @@ class Filer {
 
 	size_t len = p->second.first.length();
 	if (len < p->second.second) {
-	  if (bl.length()) {
+	  if (zero_tail || bl.length()) {
 	    bufferptr bp(p->second.second - p->second.first.length());
 	    bp.zero();
 	    bl.push_front(bp);
diff --git a/src/osdc/Objecter.cc b/src/osdc/Objecter.cc
index a1f40c62fcf..291013179a8 100644
--- a/src/osdc/Objecter.cc
+++ b/src/osdc/Objecter.cc
@@ -1875,7 +1875,7 @@ void Objecter::_sg_read_finish(vector<ObjectExtent>& extents, vector<bufferlist>
       r.add_partial_result(*bit, eit->buffer_extents);
     }
     bl->clear();
-    r.assemble_result(*bl);
+    r.assemble_result(*bl, false);
   } else {
     ldout(cct, 15) << "  only one frag" << dendl;
     bl->claim(resultbl[0]);