diff --git a/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp
index aa23d19a8..df9e350f3 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp
@@ -14,6 +14,7 @@
 //     is_partitioned(InputIterator first, InputIterator last, Predicate pred);
 
 #include <algorithm>
+#include <functional>
 #include <cassert>
 
 #include "test_iterators.h"