diff --git a/sys/fs/msdosfs/msdosfs_vnops.c b/sys/fs/msdosfs/msdosfs_vnops.c
--- a/sys/fs/msdosfs/msdosfs_vnops.c
+++ b/sys/fs/msdosfs/msdosfs_vnops.c
@@ -1942,6 +1942,9 @@
 	case _PC_NO_TRUNC:
 		*ap->a_retval = 0;
 		return (0);
+	case _PC_HAS_HIDDENSYSTEM:
+		*ap->a_retval = 1;
+		return (0);
 	default:
 		return (vop_stdpathconf(ap));
 	}
diff --git a/sys/fs/smbfs/smbfs_vnops.c b/sys/fs/smbfs/smbfs_vnops.c
--- a/sys/fs/smbfs/smbfs_vnops.c
+++ b/sys/fs/smbfs/smbfs_vnops.c
@@ -810,6 +810,9 @@
 	    case _PC_NO_TRUNC:
 		*retval = 1;
 		break;
+	    case _PC_HAS_HIDDENSYSTEM:
+		*retval = 1;
+		break;
 	    default:
 		error = vop_stdpathconf(ap);
 	}
diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c
--- a/sys/fs/tmpfs/tmpfs_vnops.c
+++ b/sys/fs/tmpfs/tmpfs_vnops.c
@@ -1691,6 +1691,10 @@
 		*retval = PAGE_SIZE;
 		break;
 
+	case _PC_HAS_HIDDENSYSTEM:
+		*retval = 1;
+		break;
+
 	default:
 		error = vop_stdpathconf(v);
 	}
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -456,6 +456,7 @@
 		case _PC_MAC_PRESENT:
 		case _PC_NAMEDATTR_ENABLED:
 		case _PC_HAS_NAMEDATTR:
+		case _PC_HAS_HIDDENSYSTEM:
 			*ap->a_retval = 0;
 			return (0);
 		default:
diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -156,6 +156,7 @@
 #define	_PC_DEALLOC_PRESENT	65
 #define	_PC_NAMEDATTR_ENABLED	66
 #define	_PC_HAS_NAMEDATTR	67
+#define	_PC_HAS_HIDDENSYSTEM	68
 #endif
 
 /* From OpenSolaris, used by SEEK_DATA/SEEK_HOLE. */
diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -2720,6 +2720,9 @@
 	case _PC_SYMLINK_MAX:
 		*ap->a_retval = MAXPATHLEN;
 		break;
+	case _PC_HAS_HIDDENSYSTEM:
+		*ap->a_retval = 1;
+		break;
 
 	default:
 		error = vop_stdpathconf(ap);