diff --git a/nixos/linux.nix b/nixos/linux.nix
index 3c7eb47..2e0ffc5 100644
--- a/nixos/linux.nix
+++ b/nixos/linux.nix
@@ -262,7 +262,7 @@ in {
           -subj "/CN=mainframe.philippeterson.com" \
           -keyout "$SSL_DIR/server.key" \
           -out "$SSL_DIR/server.crt"
-        chmod 640 "$SSL_DIR/server.key"
+        chmod 600 "$SSL_DIR/server.key"
         chmod 644 "$SSL_DIR/server.crt"
         chown 999:999 "$SSL_DIR/server.key" "$SSL_DIR/server.crt"
       fi