diff
--- a/code.c
+++ b/code.c
@@ -47,7 +47,7 @@
 34       if (!use_col_separator)
 47       else if (!join_lines && *col_sep_string == '\t') // In this case, col_sep_length must be 1.
-           if (strncmp(col_sep_string, "\t", 1) == 0)
+           if (col_sep_string[1] == '\0')
 