diff --git a/src/coredumpy/utils.py b/src/coredumpy/utils.py
index 86c9e1e..7c4fd05 100644
--- a/src/coredumpy/utils.py
+++ b/src/coredumpy/utils.py
@@ -4,6 +4,7 @@
 
 import datetime
 import os
+import re
 
 
 def get_dump_filename(frame, path, directory):
@@ -15,6 +16,8 @@ def get_dump_filename(frame, path, directory):
         return os.path.abspath(path)
 
     funcname = os.path.basename(frame.f_code.co_name)
+    funcname = re.sub(r"[^a-zA-Z0-9_]", "", funcname)
+
     d = datetime.datetime.now()
     filename = f"coredumpy_{funcname}_{d.strftime('%Y%m%d_%H%M%S_%f')}.dump"
 
diff --git a/tests/base.py b/tests/base.py
index 056e187..21f05e8 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -40,8 +40,8 @@ def run_script(self, script, expected_returncode=0):
             process = subprocess.Popen(normalize_commands(["python", f"{tmpdir}/script.py"]),
                                        stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             stdout, stderr = process.communicate()
-            self.assertEqual(process.returncode, expected_returncode,
-                             f"script failed with return code {process.returncode}\n{stderr}")
             stdout = stdout.decode()
             stderr = stderr.decode()
+            self.assertEqual(process.returncode, expected_returncode,
+                             f"script failed with return code {process.returncode}\n{stderr}")
         return stdout, stderr
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 412c1fb..8613d70 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -8,16 +8,19 @@
 from .base import TestBase
 
 
-class TestUtils(TestBase):
-    def test_get_dump_filename(self):
-        class FakeFrame:
-            def __init__(self, name):
-                self.f_code = FakeCode(name)
+class FakeCode:
+    def __init__(self, name):
+        self.co_name = name
+
 
-        class FakeCode:
-            def __init__(self, name):
-                self.co_name = name
+class FakeFrame:
+    def __init__(self, name):
+        self.f_code = FakeCode(name)
 
+
+class TestUtils(TestBase):
+
+    def test_get_dump_filename(self):
         frame = FakeFrame("test_get_dump_filename")
         filename = get_dump_filename(frame, None, None)
         self.assertEqual(filename, os.path.abspath(filename))
@@ -36,3 +39,9 @@ def __init__(self, name):
 
         with self.assertRaises(ValueError):
             filename = get_dump_filename(frame, "test.dump", "dir")
+
+    def test_escape_name(self):
+        frame = FakeFrame("<module>")
+        filename = get_dump_filename(frame, None, None)
+        self.assertNotIn("<", filename)
+        self.assertNotIn(">", filename)