diff --git a/tests/integration/rpsc-test.nix b/tests/integration/rpsc-test.nix
index de472df..44e4368 100644
--- a/tests/integration/rpsc-test.nix
+++ b/tests/integration/rpsc-test.nix
@@ -34,11 +34,12 @@ let
 
   generateWgKeys =
     name:
+    sk:
     let
       # The trailing line break that is generated by `wg genkey` and `wg pubkey` breaks the script rp-key-sync.nix to copy the preshared keys.
       # We therefore remove the trailing spaces here.
       privateKey = pkgs.runCommand "wg-private-${name}" { } ''
-        ${pkgs.wireguard-tools}/bin/wg genkey > $out
+        echo ${sk} > $out
       '';
       publicKey = pkgs.runCommand "wg-public-${name}" { } ''
         cat ${privateKey} | ${pkgs.wireguard-tools}/bin/wg pubkey > $out
@@ -48,9 +49,9 @@ let
       inherit privateKey publicKey;
     };
 
-  peerAWgKeys = generateWgKeys "peerA";
-  peerBWgKeys = generateWgKeys "peerB";
-  peerCWgKeys = if multiPeer then generateWgKeys "peerC" else null;
+  peerAWgKeys = generateWgKeys "peerA" "EMeaSKGSSWQFuA8xhca+potK7B43hPsJ9XkUXtfaNF0=";
+  peerBWgKeys = generateWgKeys "peerB" "ANLij+xiMYmxpFjYcOTt4z8pX1a91Gsg4ZLpcCrjGVg=";
+  peerCWgKeys = if multiPeer then generateWgKeys "peerC" "COOk7sSt34r3xtwCvOdqQiv2Pf4auKI+Btgyce2fw1w=" else null;
 
   generateRPKeys =
     name: rosenpassVersion: