diff --git a/clang/lib/Index/IndexRecordHasher.h b/clang/lib/Index/IndexRecordHasher.h
index da396fc7f7c1c..4ca663c30957f 100644
--- a/clang/lib/Index/IndexRecordHasher.h
+++ b/clang/lib/Index/IndexRecordHasher.h
@@ -10,6 +10,7 @@
 #define LLVM_CLANG_LIB_INDEX_INDEXRECORDHASHER_H
 
 #include <array>
+#include <stdint.h>
 
 namespace clang {
 class ASTContext;