diff --git a/lib/node.hpp b/lib/node.hpp
index 9a4380819c8b773ed44ddbeaaae500748dd45636..244e530be40cf68a61f1c8f91b35c6204c109b51 100644
--- a/lib/node.hpp
+++ b/lib/node.hpp
@@ -53,7 +53,7 @@ private:
     unsigned nLocalParticles_;
 
     double totalMass_;
-    const double theta0_ = 0.1;
+    const double theta0_ = 0.0;
     const double minNParticles_ = 32;
     const double maxDepth_ = 24;
     bool isLeaf_;