diff --git a/test/unordered/link_test_1.cpp b/test/unordered/link_test_1.cpp
index 3419d9da..7b03c973 100644
--- a/test/unordered/link_test_1.cpp
+++ b/test/unordered/link_test_1.cpp
@@ -7,8 +7,12 @@
 #include "../helpers/unordered.hpp"
 
 #ifdef BOOST_UNORDERED_FOA_TESTS
+
+#include <boost/unordered/concurrent_flat_map.hpp>
+
 void foo(boost::unordered_flat_set<int>&, boost::unordered_flat_map<int, int>&,
-  boost::unordered_node_set<int>&, boost::unordered_node_map<int, int>&);
+  boost::unordered_node_set<int>&, boost::unordered_node_map<int, int>&,
+  boost::concurrent_flat_map<int, int>&);
 
 int main()
 {
@@ -16,8 +20,9 @@ int main()
   boost::unordered_flat_map<int, int> x2;
   boost::unordered_node_set<int> x3;
   boost::unordered_node_map<int, int> x4;
+  boost::concurrent_flat_map<int, int> x5;
 
-  foo(x1, x2, x3, x4);
+  foo(x1, x2, x3, x4, x5);
 
   return 0;
 }
diff --git a/test/unordered/link_test_2.cpp b/test/unordered/link_test_2.cpp
index aea7a728..917544dd 100644
--- a/test/unordered/link_test_2.cpp
+++ b/test/unordered/link_test_2.cpp
@@ -7,9 +7,13 @@
 #include "../helpers/unordered.hpp"
 
 #ifdef BOOST_UNORDERED_FOA_TESTS
+
+#include <boost/unordered/concurrent_flat_map.hpp>
+
 void foo(boost::unordered_flat_set<int>& x1,
   boost::unordered_flat_map<int, int>& x2, boost::unordered_node_set<int>& x3,
-  boost::unordered_node_map<int, int>& x4)
+  boost::unordered_node_map<int, int>& x4,
+  boost::concurrent_flat_map<int, int>& x5)
 {
 #if BOOST_WORKAROUND(BOOST_CODEGEARC, BOOST_TESTED_AT(0x0613))
   struct dummy
@@ -23,6 +27,7 @@ void foo(boost::unordered_flat_set<int>& x1,
   x2[2] = 2;
   x3.insert(3);
   x4.insert(std::make_pair(4, 5));
+  x5.insert(std::make_pair(5, 6));
 }
 #else
 void foo(boost::unordered_set<int>& x1, boost::unordered_map<int, int>& x2,