diff --git a/conf/php.ini b/conf/php.ini
index 7b1d294..3952628 100644
--- a/conf/php.ini
+++ b/conf/php.ini
@@ -28,6 +28,8 @@ hhvm.force_hh=0
 ; HHVM from automatically removing it, so allows you to use 'perf report' after
 ; the process has exited. No impact on HHVM's actual performance.
 hhvm.keep_perf_pid_map=1
+; Actually flush and display fatal errors.
+hhvm.server.implicit_flush=1
 
 ;;;;;;;;;;;;;;;
 ; PHP5/7 Only ;