diff --git a/llvm/include/llvm/Attributes.h b/llvm/include/llvm/Attributes.h
index bc7628011f77..1e54ddfc87f4 100644
--- a/llvm/include/llvm/Attributes.h
+++ b/llvm/include/llvm/Attributes.h
@@ -15,6 +15,7 @@
 #ifndef LLVM_ATTRIBUTES_H
 #define LLVM_ATTRIBUTES_H
 
+#include <cassert>
 #include <string>
 
 namespace llvm {