diff --git a/kernel/functional.cc b/kernel/functional.cc
index 1ece145e59f..11f030eae14 100644
--- a/kernel/functional.cc
+++ b/kernel/functional.cc
@@ -22,6 +22,7 @@
 #include "kernel/topo_scc.h"
 #include "ff.h"
 #include "ffinit.h"
+#include <deque>
 
 YOSYS_NAMESPACE_BEGIN
 namespace Functional {
diff --git a/tests/functional/vcd_harness.cc b/tests/functional/vcd_harness.cc
index 7232172348a..30238429b6e 100644
--- a/tests/functional/vcd_harness.cc
+++ b/tests/functional/vcd_harness.cc
@@ -4,6 +4,7 @@
 #include <random>
 #include <ctype.h>
 #include <vector>
+#include <unordered_map>
 
 #include "my_module_functional_cxx.cc"