diff --git a/hosts/hydra-1/configuration.nix b/hosts/hydra-1/configuration.nix
index 7a6fad8..7bd2095 100644
--- a/hosts/hydra-1/configuration.nix
+++ b/hosts/hydra-1/configuration.nix
@@ -26,7 +26,7 @@
   networking.nameservers = [ "2001:638:904:ffcc::3" "2001:638:904:ffcc::4" "141.24.40.3" "141.24.40.4" ];
 
   nix = {
-    settings.allowed-uris = "http:// https:// github:";
+    settings.allowed-uris = "http: https: github:";
     distributedBuilds = true;
     buildMachines = [
       {
diff --git a/hosts/hydra-2/configuration.nix b/hosts/hydra-2/configuration.nix
index dee0d0a..8dc1418 100644
--- a/hosts/hydra-2/configuration.nix
+++ b/hosts/hydra-2/configuration.nix
@@ -26,7 +26,7 @@
   networking.nameservers = [ "2001:638:904:ffcc::3" "2001:638:904:ffcc::4" "141.24.40.3" "141.24.40.4" ];
 
   # Allow Hydra to fetch remote URLs in restricted mode
-  nix.settings.allowed-uris = "http:// https:// github:";
+  nix.settings.allowed-uris = "http: https: github:";
 
   services.openssh.settings= {
    PermitRootLogin = "yes";