1 files changed, 1 insertions, 1 deletions
diff --git a/hst/hst.go b/hst/hst.go
index 7fd7619c..bdff19f8 100644
--- a/hst/hst.go
+++ b/hst/hst.go
@@ -16,7 +16,7 @@ type AppError struct {
 	// A user-facing description of where the error occurred.
 	Step string `json:"step"`
 	// The underlying error value.
-	Err error
+	Err error `json:"err"`
 	// An arbitrary error message, overriding the return value of Message if not empty.
 	Msg string `json:"message,omitempty"`
 }