diff --git a/crossfire/logging.rkt b/crossfire/logging.rkt
index f83f298..8200f75 100644
--- a/crossfire/logging.rkt
+++ b/crossfire/logging.rkt
@@ -57,11 +57,13 @@
           [_        "<7>"]))
 
       ;; in UTC
-      (define time-str (date->string (seconds->date (* 0.001 (current-inexact-milliseconds)) #f) #t))
+      (define time-str
+        (date->string (seconds->date (* 0.001 (current-inexact-milliseconds)) #f) #t))
       ;; prefix each line of the log entry with the metadata
       (define msg-lines (string-split msg "\n"))
       (for ([line (in-list msg-lines)])
-        (printf "~a[~aZ] [~a] ~a\n" prefix-str time-str level-str line))))
+        (printf "~a[~aZ] [~a] ~a\n" prefix-str time-str level-str line)
+        (flush-output (current-output-port)))))
 
   ;; process log entries until told to stop
   ;; this uses the same technique as with-intercepted-logging