diff --git a/corsika/detail/modules/pythia8/Decay.inl b/corsika/detail/modules/pythia8/Decay.inl
index d58ac21d851ff8b19be258e09e9a63a500784b1a..eb8cbd2e5d6c6b1bc3b52b9999be634ffe079934 100644
--- a/corsika/detail/modules/pythia8/Decay.inl
+++ b/corsika/detail/modules/pythia8/Decay.inl
@@ -55,7 +55,7 @@ namespace corsika::pythia8 {
     Pythia8::Pythia::readString("Check:event = 1");
 
     Pythia8::Pythia::readString("ProcessLevel:all = off");
-    Pythia8::Pythia::readString("ProcessLevel:resonanceDecays = off");
+    Pythia8::Pythia::readString("ProcessLevel:resonanceDecays = on");
 
     // making sure
     setStable(Code::Pi0);