--- a/dom/cache/DBSchema.cpp
+++ b/dom/cache/DBSchema.cpp
@@ -3179,17 +3179,17 @@ nsresult MigrateFrom25To26(mozIStorageCo
   // Add the response_padding_size column.
   // Note: only opaque repsonse should be non-null interger.
   nsresult rv = aConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
     "ALTER TABLE entries "
     "ADD COLUMN response_padding_size INTEGER NULL "
   ));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
-  aConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+  rv = aConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
     "UPDATE entries SET response_padding_size = 0 "
       "WHERE response_type = 4" // opaque response
   ));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = aConn->SetSchemaVersion(26);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }