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diff --git a/liblttng-ust/creds.h b/liblttng-ust/creds.h
new file mode 100644
index 00000000..b29319e0
--- /dev/null
+++ b/liblttng-ust/creds.h
@@ -0,0 +1,29 @@
+#ifndef _LTTNG_CREDS_H
+#define _LTTNG_CREDS_H
+
+/*
+ * Copyright (c) 2019 - Michael Jeanson <mjeanson@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * This is used in the kernel as an invalid value.
+ */
+
+#define INVALID_UID (uid_t) -1
+#define INVALID_GID (gid_t) -1
+
+#endif /* _LTTNG_CREDS_H */