diff --git a/src/@x13/print.m b/src/@x13/print.m
index b9d13c51779b4bac464919a1ca595db1c36a49ee..9c472a87061a5a3de3f7489b0ad3a699fb3cbbab 100644
--- a/src/@x13/print.m
+++ b/src/@x13/print.m
@@ -70,10 +70,10 @@ if ismember('regression', o.commands)
                     conditionningvariables = strsplit(o.regression.user, {',' , '(' , ')' , ' '});
                     conditionningvariables = conditionningvariables(~cellfun(@isempty,conditionningvariables));
                     % Check that these data are available.
-                    for i=1:length(conditionningvariables)
-                        if ~ismember(conditionningvariables{i}, o.x.name)
+                    for j=1:length(conditionningvariables)
+                        if ~ismember(conditionningvariables{j}, o.x.name)
                             fclose(fid);
-                            error('x13:regression: Variable %s is unkonwn', conditionningvariables{i})
+                            error('x13:regression: Variable %s is unkonwn', conditionningvariables{j})
                         end
                     end
                     % Select the data.
@@ -349,10 +349,10 @@ if ismember('x11regression', o.commands)
                     conditionningvariables = strsplit(o.x11regression.user, {',' , '(' , ')' , ' '});
                     conditionningvariables = conditionningvariables(~cellfun(@isempty,conditionningvariables));
                     % Check that these data are available.
-                    for i=1:length(conditionningvariables)
-                        if ~ismember(conditionningvariables{i}, o.x.name)
+                    for j=1:length(conditionningvariables)
+                        if ~ismember(conditionningvariables{j}, o.x.name)
                             fclose(fid);
-                            error('x13:x11regression: Variable %s is unknown', conditionningvariables{i})
+                            error('x13:x11regression: Variable %s is unknown', conditionningvariables{j})
                         end
                     end
                     % Select the data.