--- a/inst/@dataframe/isnumeric.m
+++ b/inst/@dataframe/isnumeric.m
@@ -34,6 +34,6 @@
   endfor
   
   resu = isnumeric(zeros(0, class(sum(cellfun(@(x) zeros(1, class(x(1))),...
-					      df._data)))));
+                                              df._data)))));
 
 endfunction