diff --git a/modules/python/src2/gen2.py b/modules/python/src2/gen2.py
index 20c5c812ccad9df5897207e29ca5a10a96a5f6d5..20c1007deeb55d002551eb3669165a59eb6e8fae 100755
--- a/modules/python/src2/gen2.py
+++ b/modules/python/src2/gen2.py
@@ -228,6 +228,7 @@ gen_template_rw_prop_init = Template("""
 
 simple_argtype_mapping = {
     "bool": ("bool", "b", "0"),
+    "size_t": ("size_t", "I", "0"),
     "int": ("int", "i", "0"),
     "float": ("float", "f", "0.f"),
     "double": ("double", "d", "0"),