diff --git a/layout/base/ServoRestyleManager.cpp b/layout/base/ServoRestyleManager.cpp
index ed47199934f8..08652ec6ac63 100644
--- a/layout/base/ServoRestyleManager.cpp
+++ b/layout/base/ServoRestyleManager.cpp
@@ -8,6 +8,7 @@
 #include "mozilla/ServoStyleSet.h"
 #include "mozilla/dom/ChildIterator.h"
 #include "nsContentUtils.h"
+#include "nsPrintfCString.h"
 #include "nsStyleChangeList.h"
 
 using namespace mozilla::dom;