diff --git a/corsika/detail/modules/writers/ParticleWriterParquet.inl b/corsika/detail/modules/writers/ParticleWriterParquet.inl
index 5fdd9ba517a82479978c73c5dddc649a9b2dd16f..e6508fac40320ba022d6bdec4c7ac053bde6fa3d 100644
--- a/corsika/detail/modules/writers/ParticleWriterParquet.inl
+++ b/corsika/detail/modules/writers/ParticleWriterParquet.inl
@@ -37,8 +37,6 @@ namespace corsika {
                      parquet::ConvertedType::NONE);
     output_.addField("z", parquet::Repetition::REQUIRED, parquet::Type::FLOAT,
                      parquet::ConvertedType::NONE);
-    output_.addField("z", parquet::Repetition::REQUIRED, parquet::Type::FLOAT,
-                     parquet::ConvertedType::NONE);
     output_.addField("weight", parquet::Repetition::REQUIRED, parquet::Type::FLOAT,
                      parquet::ConvertedType::NONE);
 
diff --git a/corsika/modules/writers/ParticleWriterParquet.hpp b/corsika/modules/writers/ParticleWriterParquet.hpp
index 05b49cce89982682856ca8c3f5617e24dc9fafd5..6fa0bdd8c5626411eef561561355ed0c58fefaa3 100644
--- a/corsika/modules/writers/ParticleWriterParquet.hpp
+++ b/corsika/modules/writers/ParticleWriterParquet.hpp
@@ -51,15 +51,15 @@ namespace corsika {
      */
     void write(Code const& pid, units::si::HEPEnergyType const& energy,
                units::si::LengthType const& x, units::si::LengthType const& y,
-               units::si::LengthType const& z,
-               const double weight);
+               units::si::LengthType const& z, const double weight);
 
     /**
      * Write a Code::Nucleus particle to the file.
      */
     void write(unsigned int const A, unsigned int const Z,
                units::si::HEPEnergyType const& energy, units::si::LengthType const& x,
-               units::si::LengthType const& y, units::si::LengthType const& z, const double weight);
+               units::si::LengthType const& y, units::si::LengthType const& z,
+               const double weight);
 
     /**
      * Return collected library-level summary for output.