diff --git a/matlab/gensylv/sylvester3.m b/matlab/gensylv/sylvester3.m
index aabdc6650..be4d8c574 100644
--- a/matlab/gensylv/sylvester3.m
+++ b/matlab/gensylv/sylvester3.m
@@ -52,6 +52,7 @@ else
 end
 i = 1;
 c = zeros(n,1,p);
+c1 = zeros(n,1,p);
 while i < m
     if t(i+1,i) == 0
         if i == 1