diff --git a/iguana/exchanges/LP_prices.c b/iguana/exchanges/LP_prices.c
index 62d156beb..3ceef6889 100644
--- a/iguana/exchanges/LP_prices.c
+++ b/iguana/exchanges/LP_prices.c
@@ -721,7 +721,7 @@ void prices_loop(void *ignore)
                                     price = 0.5 * (coinpp->bid + coinpp->ask);
                                     if ( (margin= coinpp->margins[btcpp->ind]) != 0. )
                                     {
-                                        price = 1. / (price * (1. - margin));
+                                        price = 1. / (price * (1. + margin));
                                         if ( (minprice= coinpp->minprices[btcpp->ind]) == 0. || price >= minprice )
                                         {
                                             LP_mypriceset(&changed,"BTC",name,price);
@@ -731,7 +731,7 @@ void prices_loop(void *ignore)
                                     }
                                     if ( (margin= btcpp->margins[coinpp->ind]) != 0. )
                                     {
-                                        price = 1. / (price * (1. + margin));
+                                        price = 1. / (price * (1. - margin));
                                         if ( (minprice= btcpp->minprices[coinpp->ind]) == 0. || price >= minprice )
                                         {
                                             LP_mypriceset(&changed,name,"BTC",price);