diff --git a/matlab/pm3_core.m b/matlab/pm3_core.m
index 2fdd3aa1ed3270af1a9fe8b773522a5265f13b2b..be15e0f13777f2a9a6830d0013915297bf365a4b 100644
--- a/matlab/pm3_core.m
+++ b/matlab/pm3_core.m
@@ -101,7 +101,7 @@ for i=fpar:nvar
         title(name,'Interpreter','none')
     end
     
-    if isstruct(options_.parallel)
+    if whoiam,
         if Parallel(ThisMatlab).Local==0
              DirectoryName = CheckPath('Output');
         end