diff --git a/lib/support.js b/lib/support.js
index 6ecaec0..ef77a95 100644
--- a/lib/support.js
+++ b/lib/support.js
@@ -135,7 +135,7 @@ function decimalToCoin(amount) {
 }
 
 function bitcoinDecimalToCoin(amount) {
-    return amount * 100000000;
+    return Math.round(amount * 100000000);
 }
 
 function bitcoinCoinToDecimal(amount) {