diff --git a/benchmarks/SimpleAlloc/SimpleAlloc.cpp b/benchmarks/SimpleAlloc/SimpleAlloc.cpp
index cd5d7906a..683d4834e 100644
--- a/benchmarks/SimpleAlloc/SimpleAlloc.cpp
+++ b/benchmarks/SimpleAlloc/SimpleAlloc.cpp
@@ -2,9 +2,12 @@
 
 using namespace Upp;
 
-#define N 20000000
+#define N 50000000
+#define MIX 30
 
 void *ptr[N];
+void *mix[MIX];
+int   len[N];
 
 CONSOLE_APP_MAIN
 {
@@ -20,4 +23,16 @@ CONSOLE_APP_MAIN
 			delete[] ptr[i];
 		RLOG("Free " << tm);
 	}
+	{
+		for(int i = 0; i < N; i++)
+			len[i] = Random(1000 + 500);
+		TimeStop tm;
+		for(int i = 0; i < N / MIX; i++) {
+			int ii = i % MIX;
+			if(mix[ii])
+				delete[] mix[ii];
+			mix[ii] = new byte[len[i]];
+		}
+		RLOG("Mix " << tm);
+	}
 }
diff --git a/benchmarks/SimpleAlloc/SimpleAlloc.upp b/benchmarks/SimpleAlloc/SimpleAlloc.upp
index 39575f31a..22b5ba2c1 100644
--- a/benchmarks/SimpleAlloc/SimpleAlloc.upp
+++ b/benchmarks/SimpleAlloc/SimpleAlloc.upp
@@ -7,6 +7,6 @@ file
 	SimpleAlloc.cpp;
 
 mainconfig
-	"" = "",
-	"" = "USEMALLOC";
+	"" = "MT",
+	"" = "USEMALLOC MT";