diff --git a/cpp/switchchain.cpp b/cpp/switchchain.cpp
index 9fccb10b01bc2834dd2111e27d01d2d80a505953..88c661e51c188682775e3ff0659f274d5cea1b69 100644
--- a/cpp/switchchain.cpp
+++ b/cpp/switchchain.cpp
@@ -181,7 +181,7 @@ int main() {
     // Expect:  #tri = const * n^{ something }
     // The goal is to find the 'something' by finding the number of triangles
     // for different values of n and tau
-    float tauValues[] = {2.1f, 2.2f, 2.3f, 2.4f, 2.5f, 2.6f, 2.7f, 2.8f};
+    float tauValues[] = {2.1f, 2.2f, 2.3f, 2.4f, 2.5f, 2.6f, 2.7f, 2.8f, 2.9f};
 
     Graph g;
     Graph g1;