diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73dd7510..628da137 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Specifying custom residues to retrain Casanovo is now possible.
 - Upgrade to depthcharge v0.2.3 to fix sinusoidal encoding and for the `PeptideTransformerDecoder` hotfix.
 - Enable gradients during prediction and validation to avoid NaNs from occuring as a temporary workaround until a new Pytorch version is available.
+- Correctly report amino acid precision and recall during validation.
 
 ## [3.3.0] - 2023-04-04
 
diff --git a/casanovo/denovo/model.py b/casanovo/denovo/model.py
index e3f5655d..5851aa76 100644
--- a/casanovo/denovo/model.py
+++ b/casanovo/denovo/model.py
@@ -766,8 +766,8 @@ def validation_step(
 
         aa_precision, _, pep_precision = evaluate.aa_match_metrics(
             *evaluate.aa_match_batch(
-                peptides_pred,
                 peptides_true,
+                peptides_pred,
                 self.decoder._peptide_mass.masses,
             )
         )