diff --git a/test/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp b/test/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp
index 71353aea..82e44b41 100644
--- a/test/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp
+++ b/test/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <queue>
 #include <cassert>
+#include <functional>
 
 template <class C>
 C
diff --git a/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp b/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp
index de96cd92..2c73cbc6 100644
--- a/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp
+++ b/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <queue>
 #include <cassert>
+#include <functional>
 
 template <class C>
 C
diff --git a/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp b/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp
index 84839b14..f1129bc1 100644
--- a/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp
+++ b/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <queue>
 #include <cassert>
+#include <functional>
 
 template <class C>
 C
diff --git a/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp b/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp
index bb3cde91..17a698c1 100644
--- a/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp
+++ b/test/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <queue>
 #include <cassert>
+#include <functional>
 
 int main()
 {