diff --git a/benchmarks/Index/Index.upp b/benchmarks/Index/Index.upp
index b87f41358..dea9fec5d 100644
--- a/benchmarks/Index/Index.upp
+++ b/benchmarks/Index/Index.upp
@@ -5,5 +5,6 @@ file
 	Index.cpp;
 
 mainconfig
-	"" = "";
+	"" = "",
+	"" = "USEMALLOC";