diff --git a/include/llvm/Assembly/PrintModulePass.h b/include/llvm/Assembly/PrintModulePass.h
index 28100805a7b..fc7e6f48a57 100644
--- a/include/llvm/Assembly/PrintModulePass.h
+++ b/include/llvm/Assembly/PrintModulePass.h
@@ -20,6 +20,7 @@
 
 #include "llvm/Pass.h"
 #include "llvm/Module.h"
+#include <iostream>
 
 namespace llvm {