diff --git a/pyinjective/utils.py b/pyinjective/utils.py
index e5b067f3..33b7030b 100644
--- a/pyinjective/utils.py
+++ b/pyinjective/utils.py
@@ -63,13 +63,13 @@ def derivative_margin_to_backend(price, quantity, leverage, denom) -> int:
 
 def binary_options_buy_margin_to_backend(price, quantity, denom) -> int:
     price_tick_size = Decimal(denom.min_price_tick_size) / pow(10, denom.quote)
-    margin = price * quantity
+    margin = Decimal(str(price)) * Decimal(str(quantity))
     exchange_margin = floor_to(margin, float(price_tick_size)) * pow(10, 18 + denom.quote)
     return int(exchange_margin)
 
 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 - (price / pow (10, denom.quote))) * quantity
+    margin = (1 - (Decimal(str(price)) / pow (10, denom.quote))) * Decimal(str(quantity))
     exchange_margin = floor_to(margin, float(price_tick_size)) * pow(10, 18 + denom.quote)
     return int(exchange_margin)