diff --git a/difftest/online_dpi/src/dpi.rs b/difftest/online_dpi/src/dpi.rs
index 27094033b..cec292c0e 100644
--- a/difftest/online_dpi/src/dpi.rs
+++ b/difftest/online_dpi/src/dpi.rs
@@ -215,7 +215,7 @@ unsafe extern "C" fn axi_write_indexedAccessPort(
 }
 
 #[no_mangle]
-unsafe extern "C" fn cosim_init() {
+unsafe extern "C" fn t1_cosim_init() {
   let args = OfflineArgs::parse();
   args.common_args.setup_logger().unwrap();
 
@@ -223,7 +223,7 @@ unsafe extern "C" fn cosim_init() {
   let mut dpi_target = DPI_TARGET.lock().unwrap();
   assert!(
     dpi_target.is_none(),
-    "cosim_init should be called only once"
+    "t1_cosim_init should be called only once"
   );
   *dpi_target = Some(driver);
 }
diff --git a/ipemu/src/TestBench.scala b/ipemu/src/TestBench.scala
index bd019a81e..3e23afc8c 100644
--- a/ipemu/src/TestBench.scala
+++ b/ipemu/src/TestBench.scala
@@ -49,9 +49,9 @@ class TestBench(generator: SerializableModuleGenerator[T1, T1Parameter]) extends
          |`endif
          |  endfunction;
          |
-         |  import "DPI-C" function void cosim_init();
+         |  import "DPI-C" function void t1_cosim_init();
          |  initial begin
-         |    cosim_init();
+         |    t1_cosim_init();
          |    clock = 1'b0;
          |    reset = 1'b1;
          |  end