diff --git a/src/vm/Semaphore.h b/src/vm/Semaphore.h
index 4f85976692..cb3ae7d93c 100644
--- a/src/vm/Semaphore.h
+++ b/src/vm/Semaphore.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "root.h"
+
 #if OS(WINDOWS)
 #include <uv.h>
 #elif OS(DARWIN)
diff --git a/src/vm/SigintWatcher.h b/src/vm/SigintWatcher.h
index e0b0449682..cf5a9aa2b0 100644
--- a/src/vm/SigintWatcher.h
+++ b/src/vm/SigintWatcher.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "root.h"
+
 #include "Semaphore.h"
 #include "SigintReceiver.h"