diff --git a/meta-poky/conf/distro/poky.conf b/meta-poky/conf/distro/poky.conf
index abfeb063b4..8a0f28a863 100644
--- a/meta-poky/conf/distro/poky.conf
+++ b/meta-poky/conf/distro/poky.conf
@@ -91,4 +91,4 @@ INHERIT += "uninative"
 INHERIT += "reproducible_build"
 
 BB_SIGNATURE_HANDLER ?= "OEEquivHash"
-BB_HASHSERVE = "auto"
+BB_HASHSERVE ??= "auto"