diff --git a/examples/call-http-endpoint-interpolation.yaml b/examples/call-http-endpoint-interpolation.yaml
index 2621d85a..8380a9aa 100644
--- a/examples/call-http-endpoint-interpolation.yaml
+++ b/examples/call-http-endpoint-interpolation.yaml
@@ -7,5 +7,7 @@ do:
   - getPet:
       call: http
       with:
+        headers:
+          content-type: application/json
         method: get
         endpoint: ${ "https://petstore.swagger.io/v2/pet/\(.petId)" }
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