diff --git a/llvm/include/llvm/Pass.h b/llvm/include/llvm/Pass.h
--- a/llvm/include/llvm/Pass.h
+++ b/llvm/include/llvm/Pass.h
@@ -28,6 +28,9 @@
 #ifndef LLVM_PASS_H
 #define LLVM_PASS_H
 
+#ifdef EXPENSIVE_CHECKS
+#include <cstdint>
+#endif
 #include <string>
 
 namespace llvm {