diff --git a/source/Evolve/OEE.h b/source/Evolve/OEE.h
index 9f970650ae..b18fa4a8bf 100644
--- a/source/Evolve/OEE.h
+++ b/source/Evolve/OEE.h
@@ -92,7 +92,7 @@ namespace emp {
             double most_complex = 0;
             double diversity = 0;
             if (coal_set.size() > 0) {
-                diversity = ShannonEntropy(coal_set);
+                diversity = Entropy(coal_set, [](std::pair<SKEL_TYPE, int> entry){return entry.second;});
             }
 
             for (auto & tax : coal_set) {
diff --git a/tests/test_OEE.cc b/tests/test_OEE.cc
index 8fe6d50e2d..ee9c3eaa8e 100644
--- a/tests/test_OEE.cc
+++ b/tests/test_OEE.cc
@@ -116,7 +116,7 @@ TEST_CASE("OEE", "[evo]") {
 
     sys_ptr->SetNextParent(0);
     sys_ptr->RemoveOrgAfterRepro(1, 7);
-    sys_ptr->AddOrg(2, 0, 7, false);
+    sys_ptr->AddOrg(2, 1, 7, false);
     sys_ptr->PrintStatus();
 
     // Adding an independent origin of 2 should increase change but not novelty
@@ -137,7 +137,23 @@ TEST_CASE("OEE", "[evo]") {
     CHECK(oee.GetDataNode("diversity")->GetCurrent() == Approx(1.5853));
     CHECK(oee.GetDataNode("complexity")->GetCurrent() == 10);
 
+    sys_ptr->SetNextParent(0);
+    sys_ptr->AddOrg(10, 3, 9, false);
+    sys_ptr->PrintStatus();
 
+    // No effect this time
+    oee.Update(8);
+    CHECK(oee.GetDataNode("change")->GetCurrent() == 0);
+    CHECK(oee.GetDataNode("novelty")->GetCurrent() == 0);
+    CHECK(oee.GetDataNode("diversity")->GetCurrent() == Approx(1.5853));
+    CHECK(oee.GetDataNode("complexity")->GetCurrent() == 10);
+
+    // Now we should see diversity change
+    oee.Update(9);
+    CHECK(oee.GetDataNode("change")->GetCurrent() == 0);
+    CHECK(oee.GetDataNode("novelty")->GetCurrent() == 0);
+    CHECK(oee.GetDataNode("diversity")->GetCurrent() == Approx(1.5));
+    CHECK(oee.GetDataNode("complexity")->GetCurrent() == 10);
 
     sys_ptr.Delete();