diff --git a/db/column_family.cc b/db/column_family.cc
index 8e4b2103d..2be22bd86 100644
--- a/db/column_family.cc
+++ b/db/column_family.cc
@@ -1060,11 +1060,13 @@ ColumnFamilySet::~ColumnFamilySet() {
   while (column_family_data_.size() > 0) {
     // cfd destructor will delete itself from column_family_data_
     auto cfd = column_family_data_.begin()->second;
-    bool last_ref __attribute__((__unused__)) = cfd->Unref();
+    bool last_ref __attribute__((__unused__));
+    last_ref = cfd->Unref();
     assert(last_ref);
     delete cfd;
   }
-  bool dummy_last_ref __attribute__((__unused__)) = dummy_cfd_->Unref();
+  bool dummy_last_ref __attribute__((__unused__));
+  dummy_last_ref = dummy_cfd_->Unref();
   assert(dummy_last_ref);
   delete dummy_cfd_;
 }