diff --git a/launch_pytest/test/launch_pytest/tools/test_process.py b/launch_pytest/test/launch_pytest/tools/test_process.py
index 396ac285d..958fb38e4 100644
--- a/launch_pytest/test/launch_pytest/tools/test_process.py
+++ b/launch_pytest/test/launch_pytest/tools/test_process.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import sys
+
 import launch
 import launch_pytest
 from launch_pytest import tools
@@ -31,7 +33,7 @@
 @pytest.fixture
 def dut():
     return launch.actions.ExecuteProcess(
-        cmd=['python3', '-c', PYTHON_SCRIPT],
+        cmd=[sys.executable, '-c', PYTHON_SCRIPT],
         cached_output=True,
         output='screen'
     )