diff --git a/src/runtime2/tests/mod.rs b/src/runtime2/tests/mod.rs
index 987afe9e1b57e9b32556bf849e308aa34a3b60f3..ce24e3034c05c44a0dd011e9418f8ea8a3ed529a 100644
--- a/src/runtime2/tests/mod.rs
+++ b/src/runtime2/tests/mod.rs
@@ -15,7 +15,7 @@ use crate::runtime2::native::{ApplicationSyncAction};
 // pub(crate) const NUM_INSTANCES: u32 = 7;   // number of test instances constructed
 // pub(crate) const NUM_LOOPS: u32 = 8;       // number of loops within a single test (not used by all tests)
 
-pub(crate) const NUM_THREADS: u32 = 2;
+pub(crate) const NUM_THREADS: u32 = 4;
 pub(crate) const NUM_INSTANCES: u32 = 1;
 pub(crate) const NUM_LOOPS: u32 = 1;