diff --git a/src/test/ECTest.cpp b/src/test/ECTest.cpp
index 9cc98c3..8f8b8d1 100644
--- a/src/test/ECTest.cpp
+++ b/src/test/ECTest.cpp
@@ -474,7 +474,8 @@ TEST(EC, MultiThreaded)
         [] (const std::size_t& eid, C0& c) {
             c.x = 1;
             c.y = 2;
-        }
+        },
+        2
     );
 
     for(unsigned int i = 0; i < 17; ++i)