1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/float.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/float.rb
index 77dd97e140..78ef94b912 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/float.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/float.rb
@@ -2,11 +2,12 @@ module ActiveRecord
   module ConnectionAdapters
     module PostgreSQL
       module OID # :nodoc:
-        class Float < Type::Float
+        class Float < Type::Float # :nodoc:
           include Infinity
 
           def cast_value(value)
             case value
+            when ::Float then     value
             when 'Infinity' then  ::Float::INFINITY
             when '-Infinity' then -::Float::INFINITY
             when 'NaN' then       ::Float::NAN