diff --git a/Make b/Make
index bbac62810c..0d3779f434 100755
--- a/Make
+++ b/Make
@@ -41,7 +41,7 @@ snap)
 *)
 	prefix="$HOME/git-test" ;;
 esac
-d="prefix=$prefix"
+d="prefix=$prefix THREADED_DELTA_SEARCH="
 
 : ${O=-O2}