diff --git a/ipc/glue/ProcessUtils_common.cpp b/ipc/glue/ProcessUtils_common.cpp
index d07faba6f437..9fd9693269a4 100644
--- a/ipc/glue/ProcessUtils_common.cpp
+++ b/ipc/glue/ProcessUtils_common.cpp
@@ -9,6 +9,7 @@
 #include "mozilla/Preferences.h"
 #include "mozilla/ipc/GeckoChildProcessHost.h"
 #include "mozilla/UniquePtrExtensions.h"
+#include "nsPrintfCString.h"
 
 namespace mozilla {
 namespace ipc {