diff --git a/pyinjective/utils.py b/pyinjective/utils.py
index 142c5453..260bee2d 100644
--- a/pyinjective/utils.py
+++ b/pyinjective/utils.py
@@ -69,7 +69,7 @@ def binary_options_buy_margin_to_backend(price, quantity, denom) -> int:
 
 def binary_options_sell_margin_to_backend(price, quantity, denom) -> int:
     price_tick_size = Decimal(denom.min_price_tick_size) / pow(10, denom.quote)
-    margin = (1 - (Decimal(str(price)) * (Decimal(str(quantity)))))
+    margin = (1 - (Decimal(str(price)))) * (Decimal(str(quantity)))
     exchange_margin = floor_to(margin, float(price_tick_size)) * pow(10, 18 + denom.quote)
     return int(exchange_margin)
 
diff --git a/setup.py b/setup.py
index 8f57fd01..a08314cb 100755
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
 EMAIL = "achilleas@injectivelabs.com"
 AUTHOR = "Injective Labs"
 REQUIRES_PYTHON = ">=3.7.0"
-VERSION = "0.5.9.2"
+VERSION = "0.5.9.3"
 
 REQUIRED = [
     "protobuf==3.19.1",