diff --git a/llvm/include/llvm/IR/PassManagerInternal.h b/llvm/include/llvm/IR/PassManagerInternal.h
index 297f5f4e07f4..92de10bcd75b 100644
--- a/llvm/include/llvm/IR/PassManagerInternal.h
+++ b/llvm/include/llvm/IR/PassManagerInternal.h
@@ -19,6 +19,7 @@
 #define LLVM_IR_PASSMANAGERINTERNAL_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/STLExtras.h"
 
 namespace llvm {