diff --git a/library/cloud/ec2 b/library/cloud/ec2
index c7c9e98f446..f5da8245672 100644
--- a/library/cloud/ec2
+++ b/library/cloud/ec2
@@ -1134,7 +1134,7 @@ def main():
             exact_count = dict(type='int', default=None),
             count_tag = dict(),
             volumes = dict(type='list'),
-            ebs_optimized = dict(),
+            ebs_optimized = dict(type='bool', default=False),
         )
     )