diff --git a/pykdebugparser/trace_codes.py b/pykdebugparser/trace_codes.py
index 3c45ff4..aa5f398 100644
--- a/pykdebugparser/trace_codes.py
+++ b/pykdebugparser/trace_codes.py
@@ -33,7 +33,8 @@ def default_trace_codes() -> Mapping[int, str]:
 def syscall_eventids(names: Iterable[str], trace_codes: Optional[Mapping[int, str]] = None) -> Set[int]:
     """
     Get the event ids of BSD syscalls by name, for `PyKdebugParser.filter_eventid`.
-    A name also matches its `_nocancel` variant (e.g. `open` gives `BSC_open` and `BSC_open_nocancel`).
+    A name also matches its `_nocancel` and `_dprotected_np` variants (e.g. `open` gives `BSC_open`,
+    `BSC_open_nocancel` and `BSC_open_dprotected_np`, which opens with a data protection class).
     :param names: Syscall names, such as `open` or `openat`.
     :param trace_codes: Mapping between code and event name; the default trace codes if omitted.
     :return: The event ids.
@@ -43,7 +44,8 @@ def syscall_eventids(names: Iterable[str], trace_codes: Optional[Mapping[int, st
     eventids = set()
     unknown = []
     for name in names:
-        matches = {codes[event] for event in (f'BSC_{name}', f'BSC_{name}_nocancel') if event in codes}
+        variants = (f'BSC_{name}', f'BSC_{name}_nocancel', f'BSC_{name}_dprotected_np')
+        matches = {codes[event] for event in variants if event in codes}
         if not matches:
             unknown.append(name)
         eventids |= matches
diff --git a/tests/test_trace_codes.py b/tests/test_trace_codes.py
index abe24a5..0980e65 100644
--- a/tests/test_trace_codes.py
+++ b/tests/test_trace_codes.py
@@ -21,6 +21,15 @@ def test_syscall_eventids():
     assert 0x40c0014 in syscall_eventids(['open'])  # the default trace codes
 
 
+def test_syscall_eventids_dprotected():
+    # Opening with a data protection class is the same call, so it is matched with the plain one.
+    trace_codes = {0x40c0014: 'BSC_open', 0x40c0638: 'BSC_open_nocancel', 0x40c0360: 'BSC_open_dprotected_np',
+                   0x40c073c: 'BSC_openat', 0x40c0368: 'BSC_openat_dprotected_np'}
+    assert syscall_eventids(['open'], trace_codes) == {0x40c0014, 0x40c0638, 0x40c0360}
+    assert syscall_eventids(['openat'], trace_codes) == {0x40c073c, 0x40c0368}
+    assert syscall_eventids(['open']) >= syscall_eventids(['open_dprotected_np'])  # the default trace codes
+
+
 def test_syscall_eventids_unknown():
     with pytest.raises(ValueError, match='unknown syscalls: nosuch'):
         syscall_eventids(['open', 'nosuch'], {0x40c0014: 'BSC_open'})