diff --git a/matlab/threads/single/isopmenmp.m b/matlab/threads/single/isopmenmp.m
new file mode 100644
index 0000000000000000000000000000000000000000..073330c909e847c445c665eeed23984725af383f
--- /dev/null
+++ b/matlab/threads/single/isopmenmp.m
@@ -0,0 +1,20 @@
+function i = isopenmp()
+% This file is called only if the mex files are not compiled with the openmp flag (mutithreaded computations).  
+ 
+% Copyright (C) 2009 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 3 of the License, or
+% (at your option) any later version.
+%
+% Dynare is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
+    i = 0;
\ No newline at end of file