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-rw-r--r--aws/base.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/aws/base.scm b/aws/base.scm
index 55346c7..21a55b9 100644
--- a/aws/base.scm
+++ b/aws/base.scm
@@ -139,7 +139,7 @@
(define* (aws-operation requester #:key name input-type output-type http documentation)
(let ((proc
- (lambda (input)
+ (lambda* (#:optional input)
(unless (eq? (aws-name input) input-type)
(error (format #f "~a: input must be of type ~a: ~a~%"
name input-type input)))