diff --git a/include/xlnt/worksheet/cell_iterator.hpp b/include/xlnt/worksheet/cell_iterator.hpp
index bcbb6bdc..ce403252 100644
--- a/include/xlnt/worksheet/cell_iterator.hpp
+++ b/include/xlnt/worksheet/cell_iterator.hpp
@@ -30,6 +30,7 @@
 #include <xlnt/xlnt_config.hpp>
 #include <xlnt/cell/cell_reference.hpp>
 #include <xlnt/worksheet/range_reference.hpp>
+#include <xlnt/worksheet/major_order.hpp>
 #include <xlnt/worksheet/worksheet.hpp>
 
 namespace xlnt {
diff --git a/tests/workbook/workbook_test_suite.cpp b/tests/workbook/workbook_test_suite.cpp
index b1a83df8..73dff8f5 100644
--- a/tests/workbook/workbook_test_suite.cpp
+++ b/tests/workbook/workbook_test_suite.cpp
@@ -214,6 +214,8 @@ public:
         iter = temp--;
         xlnt_assert_equals((*iter).title(), "Sheet2");
         xlnt_assert_equals((*temp).title(), "Sheet1");
+
+        xlnt_assert_equals(xlnt::worksheet_iterator{}, xlnt::worksheet_iterator{});
     }
 
     void test_const_iter()
diff --git a/tests/worksheet/worksheet_test_suite.cpp b/tests/worksheet/worksheet_test_suite.cpp
index b25e0d61..9a3df915 100644
--- a/tests/worksheet/worksheet_test_suite.cpp
+++ b/tests/worksheet/worksheet_test_suite.cpp
@@ -27,10 +27,9 @@
 #include <xlnt/cell/hyperlink.hpp>
 #include <xlnt/workbook/workbook.hpp>
 #include <xlnt/worksheet/column_properties.hpp>
-#include <xlnt/worksheet/row_properties.hpp>
-#include <xlnt/worksheet/range.hpp>
-#include <xlnt/worksheet/worksheet.hpp>
 #include <xlnt/worksheet/header_footer.hpp>
+#include <xlnt/worksheet/range.hpp>
+#include <xlnt/worksheet/row_properties.hpp>
 #include <xlnt/worksheet/worksheet.hpp>
 #include <helpers/test_suite.hpp>
 
@@ -1052,6 +1051,9 @@ public:
         const_range_iter++;
         const_range_iter--;
         xlnt_assert_equals(const_range_iter, const_range.begin());
+
+        xlnt_assert_equals(xlnt::cell_iterator{}, xlnt::cell_iterator{});
+        xlnt_assert_equals(xlnt::range_iterator{}, xlnt::range_iterator{});
     }
 
     void test_range_reference()