diff --git a/lib/VMCore/ParameterAttributes.cpp b/lib/VMCore/ParameterAttributes.cpp
index b6c29922a61..53f13405f42 100644
--- a/lib/VMCore/ParameterAttributes.cpp
+++ b/lib/VMCore/ParameterAttributes.cpp
@@ -13,6 +13,8 @@
 
 #include "llvm/ParameterAttributes.h"
 #include "llvm/Support/ManagedStatic.h"
+#include <cassert>
+
 using namespace llvm;
 
 static ManagedStatic<FoldingSet<ParamAttrsList> > ParamAttrsLists;