diff --git a/pkgs/by-name/bc/bcachefs-tools/kernel-module.nix b/pkgs/by-name/bc/bcachefs-tools/kernel-module.nix
index 614410a039aa..87a7aeda57e7 100644
--- a/pkgs/by-name/bc/bcachefs-tools/kernel-module.nix
+++ b/pkgs/by-name/bc/bcachefs-tools/kernel-module.nix
@@ -4,6 +4,7 @@ bcachefs-tools:
   stdenv,
   kernelModuleMakeFlags,
   kernel,
+  rustPlatform,
 }:
 
 stdenv.mkDerivation {
@@ -27,6 +28,7 @@ stdenv.mkDerivation {
   makeFlags = kernelModuleMakeFlags ++ [
     "KDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
     "INSTALL_MOD_PATH=${placeholder "out"}"
+    "RUST_LIB_SRC=${rustPlatform.rustLibSrc}"
   ];
 
   installPhase = ''