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-rw-r--r--python/analytics/option.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/analytics/option.py b/python/analytics/option.py
index c12fc816..2863e77b 100644
--- a/python/analytics/option.py
+++ b/python/analytics/option.py
@@ -160,7 +160,7 @@ class BlackSwaption(ForwardIndex):
strike_tilde,
self.T,
self.sigma,
- self.option_type) * self.notional
+ self.option_type == "payer") * self.notional
@pv.setter
def pv(self, val):
if np.isnan(val):