diff --git a/bigchaindb/fastquery.py b/bigchaindb/fastquery.py
index 985b758e..e0431a71 100644
--- a/bigchaindb/fastquery.py
+++ b/bigchaindb/fastquery.py
@@ -1,4 +1,4 @@
-from bigchaindb.utils import output_has_owner
+from bigchaindb.utils import condition_details_has_owner
 from bigchaindb.backend import query
 from bigchaindb.common.transaction import TransactionLink
 
@@ -52,7 +52,8 @@ class FastQuery:
         return [TransactionLink(tx['id'], index)
                 for tx in txs
                 for index, output in enumerate(tx['outputs'])
-                if output_has_owner(output, public_key)]
+                if condition_details_has_owner(output['condition']['details'],
+                                               public_key)]
 
     def filter_spent_outputs(self, outputs):
         """
diff --git a/bigchaindb/utils.py b/bigchaindb/utils.py
index 56bd6259..03651f8e 100644
--- a/bigchaindb/utils.py
+++ b/bigchaindb/utils.py
@@ -113,11 +113,6 @@ def condition_details_has_owner(condition_details, owner):
     return False
 
 
-def output_has_owner(output, owner):
-    return condition_details_has_owner(output['condition']['details'], owner)
-    # TODO raise proper exception, e.g. invalid tx payload?
-
-
 def is_genesis_block(block):
     """Check if the block is the genesis block.