diff --git a/matlab/get_prior_info.m b/matlab/get_prior_info.m
index 5a70176f4..c45edd67e 100644
--- a/matlab/get_prior_info.m
+++ b/matlab/get_prior_info.m
@@ -1,4 +1,4 @@
-function get_prior_info(info,plt_flag)
+function results = get_prior_info(info,plt_flag)
 % Computes various prior statistics.
 %
 % INPUTS
@@ -37,6 +37,9 @@ if nargin==1
     plt_flag = 1;
 end
 
+% Initialize returned variable.
+results = [];
+
 changed_qz_criterium_flag  = 0;
 if isempty(options_.qz_criterium)
     options_.qz_criterium = 1+1e-9;