diff --git a/src/yggdrasil/core.go b/src/yggdrasil/core.go
index 55306197..21cd2af4 100644
--- a/src/yggdrasil/core.go
+++ b/src/yggdrasil/core.go
@@ -4,6 +4,7 @@ import "io/ioutil"
 import "log"
 import "regexp"
 import "net"
+import "fmt"
 import "encoding/hex"
 import "yggdrasil/config"