diff --git a/matlab/ols/sur.m b/matlab/ols/sur.m
index 15dc52b4dfdff0d516548ebe3d562024b8cb757e..78b573abb026079a9e53570d048fab0f070c0c97 100644
--- a/matlab/ols/sur.m
+++ b/matlab/ols/sur.m
@@ -170,7 +170,7 @@ for i = 1:maxit
     end
     beta0 = oo_.sur.(model_name).beta;
     if i == maxit
-        warning('maximum nuber of iterations reached')
+        warning('maximum number of iterations reached')
     end
 end