diff --git a/types/coin_benchmark_test.go b/types/coin_benchmark_test.go
index 8c8088923e..9730284c9b 100644
--- a/types/coin_benchmark_test.go
+++ b/types/coin_benchmark_test.go
@@ -6,7 +6,7 @@ import (
 )
 
 func coinName(suffix int) string {
-	return fmt.Sprintf("coinz%d", suffix)
+	return fmt.Sprintf("coinz%04d", suffix)
 }
 
 func BenchmarkCoinsAdditionIntersect(b *testing.B) {