diff --git a/src/Coin.php b/src/Coin.php
index 2a30789..2a09501 100644
--- a/src/Coin.php
+++ b/src/Coin.php
@@ -24,7 +24,7 @@ public function add(int|float $v) {
             $v = sprintf('%f', $v);
         }
         
-        if(is_float($v)) {
+        if(!is_int($v)) {
             $precision = strlen(substr(strrchr($v, "."), 1));
             $v = intval(str_replace(".", "", $v));