diff --git a/feos-core/CHANGELOG.md b/feos-core/CHANGELOG.md
index 0c7542f8a..c5bb22e25 100644
--- a/feos-core/CHANGELOG.md
+++ b/feos-core/CHANGELOG.md
@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Added comparison for pressures of both phases in `PyPhaseDiagram.to_dict` to make the method work with `spinodal` constructor. [#224](https://github.com/feos-org/feos/pull/224)
+- Enforce the total moles when providing `State::new` with molefracs that do not add up to 1. [#227](https://github.com/feos-org/feos/pull/227)
 
 
 ## [0.6.1] 2024-01-11
diff --git a/feos-core/src/state/mod.rs b/feos-core/src/state/mod.rs
index ef8994564..e853b0d44 100644
--- a/feos-core/src/state/mod.rs
+++ b/feos-core/src/state/mod.rs
@@ -383,7 +383,7 @@ impl<E: Residual> State<E> {
         if let (None, None) = (volume, n) {
             n = Some(Moles::from_reduced(1.0))
         }
-        let n_i = n.map(|n| &x_u * n);
+        let n_i = n.map(|n| &x_u * n / x_u.sum());
         let v = volume.or_else(|| rho.and_then(|d| n.map(|n| n / d)));
 
         // check if new state can be created using default constructor