diff --git a/pkgs/by-name/ni/nixos-rebuild-ng/tests/repl.nix b/pkgs/by-name/ni/nixos-rebuild-ng/tests/repl.nix
index 1853a65bab86..1a614e8d8655 100644
--- a/pkgs/by-name/ni/nixos-rebuild-ng/tests/repl.nix
+++ b/pkgs/by-name/ni/nixos-rebuild-ng/tests/repl.nix
@@ -13,7 +13,7 @@ let
   escapeExpect = lib.strings.escapeNixString;
 
   expectSetup = ''
-    set timeout 180
+    set timeout 300
     proc expect_simple { pattern } {
       puts "Expecting: $pattern"
       expect {
@@ -76,7 +76,7 @@ runCommand "test-nixos-rebuild-repl"
 
     expect ${writeText "test-nixos-rebuild-repl-expect" ''
       ${expectSetup}
-      spawn nixos-rebuild repl --fast
+      spawn nixos-rebuild repl --no-reexec
 
       expect "nix-repl> "
 
@@ -116,7 +116,7 @@ runCommand "test-nixos-rebuild-repl"
 
     expect ${writeText "test-nixos-rebuild-repl-absolute-path-expect" ''
       ${expectSetup}
-      spawn sh -c "nixos-rebuild repl --fast --flake path:\$HOME#testconf"
+      spawn sh -c "nixos-rebuild repl --no-reexec --flake path:\$HOME#testconf"
 
       expect_simple "nix-repl>"
 
@@ -146,7 +146,7 @@ runCommand "test-nixos-rebuild-repl"
     pushd "$HOME"
     expect ${writeText "test-nixos-rebuild-repl-relative-path-expect" ''
       ${expectSetup}
-      spawn sh -c "nixos-rebuild repl --fast --flake .#testconf"
+      spawn sh -c "nixos-rebuild repl --no-reexec --flake .#testconf"
 
       expect_simple "nix-repl>"