diff --git a/petab/v1/visualize/plot_residuals.py b/petab/v1/visualize/plot_residuals.py
index 14a62f8a..230c8605 100644
--- a/petab/v1/visualize/plot_residuals.py
+++ b/petab/v1/visualize/plot_residuals.py
@@ -212,6 +212,6 @@ def plot_goodness_of_fit(
     )
 
     ax.set_title("Goodness of fit")
-    ax.set_xlabel("simulated values")
-    ax.set_ylabel("measurements")
+    ax.set_xlabel("Simulated value")
+    ax.set_ylabel("Measurement")
     return ax