diff --git a/slhdsa/key.go b/slhdsa/key.go
index b6dc20c..12bb8c7 100644
--- a/slhdsa/key.go
+++ b/slhdsa/key.go
@@ -102,7 +102,7 @@ func GenerateKey(rand io.Reader, params *params) (*PrivateKey, error) {
 	if _, err := io.ReadFull(rand, priv.PublicKey.seed[:params.n]); err != nil {
 		return nil, err
 	}
-	return generateKeyInernal(priv.seed[:], priv.prf[:], priv.PublicKey.seed[:], params)
+	return generateKeyInernal(priv.seed[:params.n], priv.prf[:params.n], priv.PublicKey.seed[:params.n], params)
 }
 
 // NewPrivateKey creates a new PrivateKey instance from the provided priv.seed||priv.prf||pub.seed||pub.root and parameters.
diff --git a/slhdsa/key_test.go b/slhdsa/key_test.go
index 7a02e47..8499ebb 100644
--- a/slhdsa/key_test.go
+++ b/slhdsa/key_test.go
@@ -137,3 +137,13 @@ func TestGenerateKeyInternal(t *testing.T) {
 		}
 	}
 }
+
+func TestGenerateKey(t *testing.T) {
+	for _, tc := range keyCases {
+		_, err := tc.params.GenerateKey(rand.Reader)
+		if err != nil {
+			t.Errorf("params.GenerateKey() = %v", err)
+			continue
+		}
+	}
+}