Index: uspace/lib/cpp/include/internal/hash_table.hpp
===================================================================
--- uspace/lib/cpp/include/internal/hash_table.hpp	(revision cf51eaedefc459622ba914508bd156668467041e)
+++ uspace/lib/cpp/include/internal/hash_table.hpp	(revision 65a0d0cc8c2467298531b0ed56aaf801faf106d3)
@@ -229,4 +229,5 @@
                         table_[idx].head = nullptr;
                 }
+                --size_;
 
                 node->unlink();
Index: uspace/lib/cpp/include/internal/hash_table_policies.hpp
===================================================================
--- uspace/lib/cpp/include/internal/hash_table_policies.hpp	(revision cf51eaedefc459622ba914508bd156668467041e)
+++ uspace/lib/cpp/include/internal/hash_table_policies.hpp	(revision 65a0d0cc8c2467298531b0ed56aaf801faf106d3)
@@ -30,4 +30,5 @@
 #define LIBCPP_INTERNAL_HASH_TABLE_POLICIES
 
+#include <tuple>
 #include <utility>