diff --git a/zipline/assets/asset_writer.py b/zipline/assets/asset_writer.py
index b3b33d7a..7d3f044f 100644
--- a/zipline/assets/asset_writer.py
+++ b/zipline/assets/asset_writer.py
@@ -319,6 +319,9 @@ class AssetDBWriter(with_metaclass(ABCMeta)):
         equities_output['first_traded'] = \
             equities_output['first_traded'].apply(self.convert_datetime)
 
+        # Convert symbols to upper case.
+        equities_output['symbol'] = equities_output.symbol.str.upper()
+
         # ******** Generate futures data ********
 
         futures_defaults = {
@@ -370,6 +373,10 @@ class AssetDBWriter(with_metaclass(ABCMeta)):
         futures_output['expiration_date'] = \
             futures_output['expiration_date'].apply(self.convert_datetime)
 
+        # Convert symbols and root_symbols to upper case.
+        futures_output['symbol'] = futures_output.symbol.str.upper()
+        futures_output['root_symbol'] = futures_output.root_symbol.str.upper()
+
         # ******** Generate exchanges data ********
 
         exchanges_defaults = {