diff --git a/cvise/tests/test_clangincludegraph.py b/cvise/tests/test_clangincludegraph.py
index bbb9cc9a..6e70ce46 100644
--- a/cvise/tests/test_clangincludegraph.py
+++ b/cvise/tests/test_clangincludegraph.py
@@ -9,6 +9,12 @@
 from cvise.utils.externalprograms import find_external_programs
 from cvise.utils.hint import Hint, HintBundle, load_hints
 from cvise.utils.process import ProcessEventNotifier
+from cvise.utils import sigmonitor
+
+
+@pytest.fixture(autouse=True)
+def signal_monitor():
+    sigmonitor.init()
 
 
 def init_pass(tmp_dir: Path, input_path: Path) -> tuple[ClangIncludeGraphPass, Any]:
diff --git a/cvise/tests/test_clexhints.py b/cvise/tests/test_clexhints.py
index 0680cd9b..1ae6e0e0 100644
--- a/cvise/tests/test_clexhints.py
+++ b/cvise/tests/test_clexhints.py
@@ -9,6 +9,13 @@
 from cvise.tests.testabstract import collect_all_transforms, collect_all_transforms_dir, validate_stored_hints
 from cvise.utils.externalprograms import find_external_programs
 from cvise.utils.process import ProcessEventNotifier
+from cvise.utils import sigmonitor
+
+
+@pytest.fixture(autouse=True)
+def signal_monitor():
+    sigmonitor.init()
+
 
 # How many times to repeat each test that involves randomness (for extra reassurance).
 RANDOM_TEST_REPETITIONS = 10
diff --git a/cvise/tests/test_ifs.py b/cvise/tests/test_ifs.py
index e545bf04..4998b3f2 100644
--- a/cvise/tests/test_ifs.py
+++ b/cvise/tests/test_ifs.py
@@ -5,6 +5,13 @@
 
 from cvise.passes.abstract import ProcessEventNotifier
 from cvise.passes.ifs import IfPass
+from cvise.utils import sigmonitor
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def signal_monitor():
+    sigmonitor.init()
 
 
 class LineMarkersTestCase(unittest.TestCase):
diff --git a/cvise/tests/test_treesitter.py b/cvise/tests/test_treesitter.py
index 278ee370..e38b2f4a 100644
--- a/cvise/tests/test_treesitter.py
+++ b/cvise/tests/test_treesitter.py
@@ -7,6 +7,13 @@
 from cvise.tests.testabstract import collect_all_transforms, collect_all_transforms_dir, validate_stored_hints
 from cvise.utils.externalprograms import find_external_programs
 from cvise.utils.process import ProcessEventNotifier
+from cvise.utils import sigmonitor
+
+
+@pytest.fixture(autouse=True)
+def signal_monitor():
+    sigmonitor.init()
+
 
 REPLACE_FUNC_DEF = 'replace-function-def-with-decl'
 ERASE_NAMESPACE = 'erase-namespace'