diff --git a/tests/sys/geom/class/mirror/conf.sh b/tests/sys/geom/class/mirror/conf.sh
index d8595f199bf3..1cb785e5113f 100644
--- a/tests/sys/geom/class/mirror/conf.sh
+++ b/tests/sys/geom/class/mirror/conf.sh
@@ -12,4 +12,11 @@ gmirror_test_cleanup()
 }
 trap gmirror_test_cleanup ABRT EXIT INT TERM
 
+syncwait()
+{
+	while $(gmirror status -s $name | grep -q SYNCHRONIZING); do
+		sleep 0.1;
+	done
+}
+
 . `dirname $0`/../geom_subr.sh