diff --git a/difftest/vcs_t1rocket.nix b/difftest/vcs_t1rocket.nix
new file mode 100644
index 000000000..2a5f721b3
--- /dev/null
+++ b/difftest/vcs_t1rocket.nix
@@ -0,0 +1,43 @@
+{ lib
+, libspike
+, libspike_interfaces
+, rustPlatform
+, rtlDesignMetadata
+, enable-trace ? false
+}:
+
+rustPlatform.buildRustPackage {
+  name = "vcs-dpi-lib";
+  src = with lib.fileset; toSource {
+    root = ./.;
+    fileset = unions [
+      ./spike_rs
+      ./offline
+      ./dpi_common
+      ./dpi_t1
+      ./dpi_t1rocket
+      ./test_common
+      ./Cargo.lock
+      ./Cargo.toml
+    ];
+  };
+
+  buildFeatures = ["dpi_common/vcs"] ++ lib.optionals enable-trace [ "dpi_common/trace" ];
+  buildAndTestSubdir = "./dpi_t1rocket";
+
+  env = {
+    SPIKE_LIB_DIR = "${libspike}/lib";
+    SPIKE_INTERFACES_LIB_DIR = "${libspike_interfaces}/lib";
+    DESIGN_VLEN = rtlDesignMetadata.vlen;
+    DESIGN_DLEN = rtlDesignMetadata.dlen;
+    SPIKE_ISA_STRING = rtlDesignMetadata.march;
+  };
+
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+  };
+
+  passthru = {
+    inherit enable-trace;
+  };
+}
diff --git a/t1rocketemu/default.nix b/t1rocketemu/default.nix
index e6d8014fb..4d2b1f5c0 100644
--- a/t1rocketemu/default.nix
+++ b/t1rocketemu/default.nix
@@ -14,7 +14,10 @@
     verilator-emu-trace = scope.callPackage ./nix/verilator.nix { verilated-c-lib = scope.verilated-c-lib-trace; };
 
     vcs-rust-package = scope.callPackage ./online_vcs { };
-    inherit (scope.vcs-rust-package) vcs-dpi-lib vcs-dpi-lib-trace vcs-offline-checker;
+    inherit (scope.vcs-rust-package) vcs-offline-checker;
+
+    vcs-dpi-lib = scope.callPackage ../difftest/vcs_t1rocket.nix { };
+    vcs-dpi-lib-trace = scope.vcs-dpi-lib.override { enable-trace = true; };
 
     vcs-emu = scope.callPackage ./nix/vcs.nix { };
     vcs-emu-trace = scope.callPackage ./nix/vcs.nix { vcs-dpi-lib = scope.vcs-dpi-lib-trace; };
diff --git a/t1rocketemu/nix/run-vcs-emulation.nix b/t1rocketemu/nix/run-vcs-emulation.nix
index 902a2c5b0..59a2478cf 100644
--- a/t1rocketemu/nix/run-vcs-emulation.nix
+++ b/t1rocketemu/nix/run-vcs-emulation.nix
@@ -17,10 +17,8 @@ stdenvNoCC.mkDerivation (finalAttr: {
     mkdir -p "$out"
 
     emuDriverArgsArray=(
-      "--elf-file"
-      "${testCase}/bin/${testCase.pname}.elf"
-      ${lib.optionalString emulator.enable-trace "--wave-path"}
-      ${lib.optionalString emulator.enable-trace "${testCase.pname}.fsdb"}
+      "+t1_elf_file=${testCase}/bin/${testCase.pname}.elf"
+      ${lib.optionalString emulator.enable-trace "+t1_wave_path=${testCase.pname}.fsdb"}
     )
     emuDriverArgs="''${emuDriverArgsArray[@]}"
     emuDriver="${emulator}/bin/t1-vcs-simulator"
diff --git a/t1rocketemu/nix/vcs.nix b/t1rocketemu/nix/vcs.nix
index 48758bd4f..5051bbeaf 100644
--- a/t1rocketemu/nix/vcs.nix
+++ b/t1rocketemu/nix/vcs.nix
@@ -33,7 +33,7 @@ let
           -debug_access+pp+dmptf+thread \
           -kdb=common_elab,hgldd_all''} \
         -file filelist.f \
-        ${vcs-dpi-lib}/lib/libdpi.a \
+        ${vcs-dpi-lib}/lib/libdpi_t1rocket.a \
         -o t1-vcs-simulator
 
       runHook postBuild