1 files changed, 3 insertions, 1 deletions
diff --git a/aws/request.scm b/aws/request.scm
index faa5e0d..e0cf58f 100644
--- a/aws/request.scm
+++ b/aws/request.scm
@@ -151,7 +151,9 @@
     (define request-parameters
       (string-join (cons* (format #f "Action=~a" operation-name)
                           (format #f "Version=~a" api-version)
-                          (serialize-aws-value input))
+                          (if input
+                              (serialize-aws-value input)
+                              '()))
                    "&"))
 
     (define payload-hash