diff --git a/matlab/disclyap_fast.m b/matlab/disclyap_fast.m
index c7192d3bc..491a7c7e0 100644
--- a/matlab/disclyap_fast.m
+++ b/matlab/disclyap_fast.m
@@ -11,7 +11,7 @@
 % Joe Pearlman and Alejandro Justiniano 
 % 3/5/2005 
 % =================================================================
-if nargin == 2 | isempty( ch ) == 1 
+if nargin == 2 || isempty( ch ) == 1 
     flag_ch = 0; 
 else 
     flag_ch = 1; 
diff --git a/matlab/partial_information/disc_riccati_fast.m b/matlab/partial_information/disc_riccati_fast.m
index 812687a71..74c3eab74 100644
--- a/matlab/partial_information/disc_riccati_fast.m
+++ b/matlab/partial_information/disc_riccati_fast.m
@@ -28,7 +28,7 @@
 % You should have received a copy of the GNU General Public License
 % along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 
-if nargin == 4 | isempty( ch ) == 1 
+if nargin == 4 || isempty( ch ) == 1 
     flag_ch = 0; 
 else 
     flag_ch = 1;