diff --git a/classes/Leth/IPAddress/IPv6/Address.php b/classes/Leth/IPAddress/IPv6/Address.php
index 255c399..76520cd 100755
--- a/classes/Leth/IPAddress/IPv6/Address.php
+++ b/classes/Leth/IPAddress/IPv6/Address.php
@@ -241,7 +241,8 @@ public function format(int $mode): string
 
 			case IP\Address::FORMAT_COMPACT:
 				$best_pos   = $zeros_pos = FALSE;
-				$best_count = $zeros_count = 0;
+				$best_count = 1;
+				$zeros_count = 0;
 				foreach ($parts as $i => $quad)
 				{
 					$parts[$i] = ($quad === '0000') ? '0' : ltrim($quad, '0');
diff --git a/tests/IPv6AddressTest.php b/tests/IPv6AddressTest.php
index b1f28ce..3f30941 100644
--- a/tests/IPv6AddressTest.php
+++ b/tests/IPv6AddressTest.php
@@ -47,6 +47,11 @@ public function providerFactory(): array
 				'::ffff:127:0:0:1',
 				'0:0:0:ffff:127:0:0:1',
 				'0000:0000:0000:ffff:0127:0000:0000:0001'),
+			array(
+				'2001:504:0:1:0:3:1898:1',
+				'2001:504:0:1:0:3:1898:1',
+				'2001:504:0:1:0:3:1898:1',
+				'2001:0504:0000:0001:0000:0003:1898:0001'),
 		);
 	}