diff --git a/src/xrt/include/xrt/xrt_results.h b/src/xrt/include/xrt/xrt_results.h
index ac16ce9ae..9ddfb68d2 100644
--- a/src/xrt/include/xrt/xrt_results.h
+++ b/src/xrt/include/xrt/xrt_results.h
@@ -66,4 +66,8 @@ typedef enum xrt_result
 	 * which is needed for the given command.
 	 */
 	XRT_ERROR_IPC_SESSION_NOT_CREATED = -15,
+	/*!
+	 * The client has already created a session on this IPC connection.
+	 */
+	XRT_ERROR_IPC_SESSION_ALREADY_CREATED = -16,
 } xrt_result_t;