diff --git a/lib/plsql/procedure.rb b/lib/plsql/procedure.rb
index f17be90a..25236375 100644
--- a/lib/plsql/procedure.rb
+++ b/lib/plsql/procedure.rb
@@ -100,11 +100,13 @@ def get_argument_metadata #:nodoc:
 
       # subprogram_id column is available just from version 10g
       subprogram_id_column = (@schema.connection.database_version <=> [10, 2, 0, 2]) >= 0 ? 'subprogram_id' : 'NULL'
+      # defaulted is available just from version 11g
+      defaulted_column = (@schema.connection.database_version <=> [11, 0, 0, 0]) >= 0 ? 'defaulted' : 'NULL'
 
       @schema.select_all(
         "SELECT #{subprogram_id_column}, object_name, TO_NUMBER(overload), argument_name, position, data_level,
               data_type, in_out, data_length, data_precision, data_scale, char_used,
-              char_length, type_owner, type_name, type_subname
+              char_length, type_owner, type_name, type_subname, #{defaulted_column}
         FROM all_arguments
         WHERE object_id = :object_id
         AND owner = :owner
@@ -115,7 +117,7 @@ def get_argument_metadata #:nodoc:
 
         subprogram_id, object_name, overload, argument_name, position, data_level,
             data_type, in_out, data_length, data_precision, data_scale, char_used,
-            char_length, type_owner, type_name, type_subname = r
+            char_length, type_owner, type_name, type_subname, defaulted = r
 
         @overloaded ||= !overload.nil?
         # if not overloaded then store arguments at key 0
@@ -155,7 +157,8 @@ def get_argument_metadata #:nodoc:
           :type_owner => type_owner,
           :type_name => type_name,
           :type_subname => type_subname,
-          :sql_type_name => sql_type_name
+          :sql_type_name => sql_type_name,
+          :defaulted => defaulted
         }
         if tmp_table_name
           @tmp_table_names[overload] << [(argument_metadata[:tmp_table_name] = tmp_table_name), argument_metadata]
diff --git a/spec/plsql/procedure_spec.rb b/spec/plsql/procedure_spec.rb
index 12c8c1e3..9a71652e 100644
--- a/spec/plsql/procedure_spec.rb
+++ b/spec/plsql/procedure_spec.rb
@@ -2251,3 +2251,49 @@ def new_candidate(status)
   end
 
 end
+
+describe '#get_argument_metadata' do
+  before(:each) do
+    plsql.execute <<-SQL
+      CREATE OR REPLACE FUNCTION magic_number(p_num INTEGER #{defaulted_clause})
+        RETURN INTEGER
+      IS
+      BEGIN
+        RETURN p_num * 2;
+      END magic_number;
+    SQL
+  end
+
+  after(:each) do
+    plsql.execute "DROP FUNCTION magic_number"
+  end
+
+  context 'on procedure with defaulted field' do
+    let(:defaulted_clause) { 'DEFAULT 21' }
+
+    it 'field\'s metadata attribute "defaulted" is Y' do
+      procedure = PLSQL::Procedure.find(plsql, :magic_number)
+      expect(procedure.arguments[0][:p_num][:defaulted]).to eq('Y')
+    end
+  end
+
+  context 'procedure without defaulted field' do
+    let(:defaulted_clause) { '' }
+
+    it 'field\'s metadata attribute "defaulted" is N' do
+      procedure = PLSQL::Procedure.find(plsql, :magic_number)
+      expect(procedure.arguments[0][:p_num][:defaulted]).to eq('N')
+    end
+  end
+
+  context 'oracle <= 10g without defaulted functionality' do
+    let(:defaulted_clause) { '' }
+
+    it 'field\'s metadata attribute "defaulted" is nil' do
+      allow(plsql.connection).to receive(:database_version).and_return([10, 2, 0, 2])
+
+      procedure = PLSQL::Procedure.find(plsql, :magic_number)
+      expect(procedure.arguments[0][:p_num][:defaulted]).to be_nil
+    end
+  end
+end