diff --git a/corsika/detail/stack/WeightStackExtension.inl b/corsika/detail/stack/WeightStackExtension.inl
index f3521e1bb2a025e2769de35c997a62bfe6420a8f..719dc81a036c5d079317dc1d0bd10a549a3b0289 100644
--- a/corsika/detail/stack/WeightStackExtension.inl
+++ b/corsika/detail/stack/WeightStackExtension.inl
@@ -43,7 +43,7 @@ namespace corsika::weights {
 
   template <typename TParentStack>
   inline std::string WeightDataInterface<TParentStack>::asString() const {
-    return fmt::format("weight={}", fmt::ptr(getWeight()));
+    return fmt::format("weight={}", getWeight());
   }
 
   template <typename TParentStack>