t/apenwarr/010-jobserver/all.do | 1 +

diff --git a/t/apenwarr/010-jobserver/all.do b/t/apenwarr/010-jobserver/all.do
index afadbaca35a28ee54514372c367dee22aef6d7bf41f1146e40ebb50071f9b9ee..317244469a4ca6685872e1e6b58ef1f8c1b18ee5a7b4f021518df13efdf79e3c 100644
--- a/t/apenwarr/010-jobserver/all.do
+++ b/t/apenwarr/010-jobserver/all.do
@@ -2,4 +2,5 @@ # We put the -j options at this toplevel to detect an earlier bug
 # where the sub-jobserver wasn't inherited by sub-sub-processes, which
 # accidentally reverted to the parent jobserver instead.
 
+unset REDO_BUILD_UUID
 redo -j 1 serialtest