diff --git a/invid-conv b/invid-conv
index 5f5fb55..c16f39a 100755
--- a/invid-conv
+++ b/invid-conv
@@ -23,7 +23,7 @@
 #    distribution.
 
 YT_URL="$1"
-INVID_BASE="https://inv.nadeko.net"
+INVID_BASE="${INVID_BASE:-https://inv.nadeko.net}"
 
 if [[ $YT_URL == *"youtu.be"* ]]
 then