diff --git a/toolkit.py b/toolkit.py
index 9dfe91fab6e933addb40dde447e31c4d6f8c2eee..2ddb7a31e246deb682fd654759e1cfe8c1c9a03f 100755
--- a/toolkit.py
+++ b/toolkit.py
@@ -411,7 +411,7 @@ class KerasROOTClassification:
         plt.grid(color='gray', linestyle='--', linewidth=1)
         plt.plot(tpr,  fpr, label='NN')
         plt.plot([0,1],[1,0], linestyle='--', color='black', label='Luck')
-        plt.xlabel("Background rejection")
+        plt.ylabel("Background rejection")
         plt.xlabel("Signal efficiency")
         plt.title('Receiver operating characteristic')
         plt.xlim(0,1)