diff --git a/erpcgen/src/templates/py_client.template b/erpcgen/src/templates/py_client.template
index a9bdfd5ee..d9ad1ed36 100644
--- a/erpcgen/src/templates/py_client.template
+++ b/erpcgen/src/templates/py_client.template
@@ -54,14 +54,14 @@ class {$iface.name}Client(interface.I{$iface.name}):
             codec.write_null_flag(True)
         else:
             codec.write_null_flag(False)
-            {$encodeValue(p.type, p.name, "codec", "            ", 0)}
+            {% if p.direction == 'inout' %}{$encodeValue(p.type, p.name & ".value", "codec", "            ", 0)}{% else %}{$encodeValue(p.type, p.name, "codec", "            ", 0)}{% endif %}
 {%  else -- isNullable %}
         if {$p.name} is None:
             raise ValueError("{$p.name} is None")
 {%   if p.type.type == 'union' %}
-        {$p.name}._write(codec, {$p.discriminator})
+        {% if p.direction == 'inout' %}{$p.name}.value._write(codec, {$p.discriminator}){% else %}{$p.name}._write(codec, {$p.discriminator}){% endif %}
 {%   else%}
-        {$encodeValue(p.type, p.name, "codec", "        ", 0)}
+        {% if p.direction == 'inout' %}{$encodeValue(p.type, p.name & ".value", "codec", "        ", 0)}{% else %}{$encodeValue(p.type, p.name, "codec", "        ", 0)}{% endif %}
 {%   endif -- isUnion %}
 {%  endif -- isNullable %}
 {% endfor -- inParams %}