diff --git a/sandboxed_api/testing.cc b/sandboxed_api/testing.cc
index 1f3e986..1a71a25 100644
--- a/sandboxed_api/testing.cc
+++ b/sandboxed_api/testing.cc
@@ -43,6 +43,7 @@ sandbox2::PolicyBuilder CreateDefaultPermissiveTestPolicy(
   if constexpr (sapi::sanitizers::IsAny()) {
     builder.AddDirectory("/proc");
   }
+  builder.AllowTcMalloc();
   return builder;
 }