diff --git a/updates/api.go b/updates/api.go
index 88513b3a..57b75a3c 100644
--- a/updates/api.go
+++ b/updates/api.go
@@ -139,7 +139,7 @@ func registerAPIEndpoints() error {
 
 					// If we could not convert to acceptable format, return an error.
 					if !converted {
-						http.Error(w, err.Error(), http.StatusNotAcceptable)
+						http.Error(w, "conversion to requested format not supported", http.StatusNotAcceptable)
 						return
 					}
 				}