diff --git a/pkgs/os-specific/linux/v4l2loopback/default.nix b/pkgs/os-specific/linux/v4l2loopback/default.nix
index 418efb57d438..475c212fd67e 100644
--- a/pkgs/os-specific/linux/v4l2loopback/default.nix
+++ b/pkgs/os-specific/linux/v4l2loopback/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   ];
 
   preBuild = ''
-    substituteInPlace Makefile --replace "modules_install" "INSTALL_MOD_PATH=$out modules_install"
+    substituteInPlace Makefile --replace-fail "modules_install" "INSTALL_MOD_PATH=$out modules_install"
     sed -i '/depmod/d' Makefile
   '';