diff --git a/lib/krebs/genipv6.nix b/lib/krebs/genipv6.nix
index 8d5ca1667..27df8bf55 100644
--- a/lib/krebs/genipv6.nix
+++ b/lib/krebs/genipv6.nix
@@ -36,7 +36,7 @@ let {
     suffixLength = addressLength - subnetPrefixLength;
   };
 
-  hash = s: head (match "0*(.*)" (substring 0 4 (hashString "sha256" s)));
+  hash = s: head (match "0*(.+)" (substring 0 4 (hashString "sha256" s)));
 
   dropLast = n: xs: reverseList (drop n (reverseList xs));
   takeLast = n: xs: reverseList (take n (reverseList xs));