diff --git a/lib/pg_query/deparse.rb b/lib/pg_query/deparse.rb
index 2e160df8..8009af03 100644
--- a/lib/pg_query/deparse.rb
+++ b/lib/pg_query/deparse.rb
@@ -1159,7 +1159,8 @@ def deparse_typecast(node)
       if deparse_item(node['typeName']) == 'boolean'
         deparse_item(node['arg']) == "'t'" ? 'true' : 'false'
       else
-        deparse_item(node['arg']) + '::' + deparse_typename(node['typeName'][TYPE_NAME])
+        context = true if node['arg']['A_Expr']
+        deparse_item(node['arg'], context) + '::' + deparse_typename(node['typeName'][TYPE_NAME])
       end
     end
 
diff --git a/spec/lib/pg_query/deparse_spec.rb b/spec/lib/pg_query/deparse_spec.rb
index ea605639..201b62c1 100644
--- a/spec/lib/pg_query/deparse_spec.rb
+++ b/spec/lib/pg_query/deparse_spec.rb
@@ -519,6 +519,12 @@
         it { is_expected.to eq query }
       end
 
+      context 'with parentheses' do
+        let(:query) { "SELECT (1 + 3)::int8" }
+
+        it { is_expected.to eq query }
+      end
+
       context 'regclass' do
         let(:query) { "SELECT ?::regclass" }