diff --git a/tools/scripts/launch_modelsim.sh b/tools/scripts/launch_modelsim.sh
index 77476b9..2cc5dbd 100755
--- a/tools/scripts/launch_modelsim.sh
+++ b/tools/scripts/launch_modelsim.sh
@@ -43,6 +43,8 @@ function print_color {
 # Launch ModelSim
 #------------------------------------------
 
+SCRIPT_DIR=$(dirname "$(realpath "$0")")
+
 # Using -voptargs=+acc makes everything visible in the simulator for GUI mode
 # and avoids some cases where simulation mismatch could otherwise occur.
 # Setting -onfinish to "stop" prevents the simulator from immediately trying to
@@ -50,23 +52,6 @@ function print_color {
 # error detection in batch mode.
 MSIM_DEFAULT="-voptargs=+acc -quiet -L unisims_ver -onfinish stop"
 
-# DO file to execute in batch mode. This script runs the simulation and adds
-# detection of error/failure assertions so that non-zero values are returned by
-# ModelSim when the testbench doesn't pass. Calling std.env.finish() or
-# $finish() will return 0. Detecting $fatal() requires that -onfinish be set to
-# stop so the simulator doesn't quit before the DO file finishes.
-DO_SCRIPT="\
-quietly set BreakOnAssertion 2                           ;\
-quietly set SIM_ERROR 0                                  ;\
-onbreak {                                                ;\
-    quietly set FINISH [lindex [runStatus -full] 2]      ;\
-    if {\$FINISH eq \"unknown\"} { set SIM_ERROR 255 }   ;\
-}                                                        ;\
-onerror { set SIM_ERROR 255 }                            ;\
-run -all                                                 ;\
-quit -force -code \$SIM_ERROR                            ;\
-"
-
 # Use specified modelsim.ini, if set
 if [[ -z $MSIM_MODELSIM_INI ]]; then
     MODELSIMINI_ARG=""
@@ -92,7 +77,7 @@ if [ $MSIM_MODE == "gui" ]; then
     if [ ${exit_status} -ne 0 ]; then exit ${exit_status}; fi
 elif [ $MSIM_MODE == "batch" ]; then
     echo "* Launching ModelSim"
-    vsim -batch -do "$DO_SCRIPT" $MODELSIMINI_ARG $MSIM_DEFAULT $MSIM_ARGS $MSIM_LIB_ARGS $MSIM_SIM_TOP 2>&1 | while IFS= read -r line; do
+    vsim -batch -do $SCRIPT_DIR/modelsim.do $MODELSIMINI_ARG $MSIM_DEFAULT $MSIM_ARGS $MSIM_LIB_ARGS $MSIM_SIM_TOP 2>&1 | while IFS= read -r line; do
         print_color $line
     done
     exit_status=${PIPESTATUS[0]}
diff --git a/tools/scripts/modelsim.do b/tools/scripts/modelsim.do
new file mode 100644
index 0000000..959058c
--- /dev/null
+++ b/tools/scripts/modelsim.do
@@ -0,0 +1,21 @@
+#
+# Copyright 2024 Ettus Research, a National Instruments Brand
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+#
+# ModelSim DO file to run a simulation in batch mode. This script adds
+# detection of error/failure assertions so that non-zero values are returned by
+# ModelSim when the testbench doesn't pass. Calling std.env.finish() or
+# $finish() will return 0. Detecting $fatal() requires that -onfinish be set to
+# stop so the simulator doesn't quit before the DO file finishes.
+#
+
+quietly set BreakOnAssertion 2
+quietly set SIM_ERROR 0
+onbreak {
+    quietly set FINISH [lindex [runStatus -full] 2]
+    if {$FINISH eq "unknown"} { set SIM_ERROR 255 }
+}
+onerror { set SIM_ERROR 255 }
+run -all
+quit -force -code $SIM_ERROR