diff --git a/cloud/amazon/ec2_ami_find.py b/cloud/amazon/ec2_ami_find.py
index 5dcc417de8d..8be578fce1c 100644
--- a/cloud/amazon/ec2_ami_find.py
+++ b/cloud/amazon/ec2_ami_find.py
@@ -299,7 +299,7 @@ def main():
                 aliases = ['search_tags', 'image_tags']),
             architecture = dict(required=False),
             hypervisor = dict(required=False),
-            is_public = dict(required=False),
+            is_public = dict(required=False, type='bool'),
             name = dict(required=False),
             platform = dict(required=False),
             sort = dict(required=False, default=None,