diff --git a/csrc/emulator.cc b/csrc/emulator.cc
index ec5990fd..8a70720e 100644
--- a/csrc/emulator.cc
+++ b/csrc/emulator.cc
@@ -3,6 +3,7 @@
 
 #include "verilated.h"
 #if VM_TRACE
+#include <memory>
 #include "verilated_vcd_c.h"
 #endif
 #include <fesvr/dtm.h>