diff --git a/app/src/main/java/com/m2049r/xmrwallet/util/BitcoinAddressValidator.java b/app/src/main/java/com/m2049r/xmrwallet/util/BitcoinAddressValidator.java
index 05d2b1e..5d1dda9 100644
--- a/app/src/main/java/com/m2049r/xmrwallet/util/BitcoinAddressValidator.java
+++ b/app/src/main/java/com/m2049r/xmrwallet/util/BitcoinAddressValidator.java
@@ -66,7 +66,7 @@ public class BitcoinAddressValidator {
 
         byte[] result = new byte[25];
         byte[] numBytes = num.toByteArray();
-        if (numBytes.length > result.length) return null;
+        if (num.bitLength() > 200) return null;
 
         if (num.bitLength() == 200) {
             System.arraycopy(numBytes, 1, result, 0, 25);