Index: psutil/_common.py
--- psutil/_common.py.orig
+++ psutil/_common.py
@@ -49,7 +49,7 @@ _DEFAULT = object()
 __all__ = [
     # OS constants
     'FREEBSD', 'BSD', 'LINUX', 'NETBSD', 'OPENBSD', 'MACOS', 'OSX', 'POSIX',
-    'SUNOS', 'WINDOWS',
+    'SECBSD', 'SUNOS', 'WINDOWS',
     # connection constants
     'CONN_CLOSE', 'CONN_CLOSE_WAIT', 'CONN_CLOSING', 'CONN_ESTABLISHED',
     'CONN_FIN_WAIT1', 'CONN_FIN_WAIT2', 'CONN_LAST_ACK', 'CONN_LISTEN',
@@ -90,8 +90,9 @@ MACOS = sys.platform.startswith("darwin")
 OSX = MACOS  # deprecated alias
 FREEBSD = sys.platform.startswith(("freebsd", "midnightbsd"))
 OPENBSD = sys.platform.startswith("openbsd")
+SECBSD = sys.platform.startswith("secbsd")
 NETBSD = sys.platform.startswith("netbsd")
-BSD = FREEBSD or OPENBSD or NETBSD
+BSD = FREEBSD or OPENBSD or SECBSD or NETBSD
 SUNOS = sys.platform.startswith(("sunos", "solaris"))
 AIX = sys.platform.startswith("aix")