diff --git a/tests/test_debuglibrary.py b/tests/test_debuglibrary.py
index cdfe052..eb40143 100644
--- a/tests/test_debuglibrary.py
+++ b/tests/test_debuglibrary.py
@@ -38,7 +38,7 @@ def check_command(command, pattern):
 
 def base_functional_testing():
     global child
-    child = pexpect.spawn('coverage',
+    child = pexpect.spawn('coverage3',
                           ['run', '--append', 'DebugLibrary/shell.py'])
     child.expect('Enter interactive shell', timeout=TIMEOUT_SECONDS * 3)
 
@@ -103,7 +103,7 @@ def step_functional_testing():
     global child
     # Command "coverage run robot tests/step.robot" does not work,
     # so start the program using DebugLibrary's shell instead of "robot".
-    child = pexpect.spawn('coverage',
+    child = pexpect.spawn('coverage3',
                           ['run', '--append', 'DebugLibrary/shell.py',
                            'tests/step.robot'])
     child.expect('Type "help" for more information.*>',