diff --git a/Framework/Particles/ParticleProperties.h b/Framework/Particles/ParticleProperties.h
index c2da034c730aa67993bbe1f44c25f922af23d3b4..ed0e919b5acce89a7b0573489695a635a0abb104 100644
--- a/Framework/Particles/ParticleProperties.h
+++ b/Framework/Particles/ParticleProperties.h
@@ -119,10 +119,6 @@ namespace corsika::particles {
            c == Code::NuMuBar || c == Code::NuTauBar;
   }
 
-  bool constexpr IsNucleus(Code const p) {
-    return detail::isNucleus[static_cast<CodeIntType>(p)];
-  }
-
   int constexpr GetNucleusA(Code const p) {
     return detail::nucleusA[static_cast<CodeIntType>(p)];
   }