diff --git a/core/src/nix/daemon.sld b/core/src/nix/daemon.sld
index 89f893c..c41c83d 100644
--- a/core/src/nix/daemon.sld
+++ b/core/src/nix/daemon.sld
@@ -66,7 +66,7 @@
            (cond
                ((eqv? event 'next) (write-string data))
                ((eqv? event 'write) (write-string data))
-               ((eqv? event 'error) (error data))
+               ((eqv? event 'error) (error "daemon logger received error" data))
                ((and (eqv? event 'activity-start) (eq? (nix-activity-type data) 104)) (set! build-activity (nix-activity-id data)))
                ((and (eqv? event 'activity-start) (eq? (nix-activity-type data) 105)) (printf "[..building ~S]\n" (vector-ref (nix-activity-fields data) 0)))
                ((and (eqv? event 'activity-result) (eqv? (nix-activity-type data) 101)) (write-string (vector-ref (nix-activity-fields data) 0)) (newline))
@@ -84,7 +84,7 @@
          ((#x64617461) (daemon-write-u64 link (daemon-read-u64 link)) (daemon-read-log-events link)) ; STDERR_READ
          ((#x64617416) ((*logger*) 'write (daemon-read-string link))  (daemon-read-log-events link)) ; STDERR_WRITE
          ((#x616c7473) ((*logger*) 'last '()) (list)) ; STDERR_LAST
-         ((#x63787470) ((*logger*) 'error (daemon-read-string link))) ; STDERR_ERROR
+         ((#x63787470) ((*logger*) 'error (daemon-read-error link))) ; STDERR_ERROR
          ((#x53545254) ((*logger*) 'activity-start (daemon-read-activity-start link)) (daemon-read-log-events link)) ; STDERR_START_ACTIVITY
          ((#x53544f50) ((*logger*) 'activity-stop (daemon-read-u64 link)) (daemon-read-log-events link))
          ((#x52534c54) ((*logger*) 'activity-result (daemon-read-activity-result link)) (daemon-read-log-events link))