diff --git a/mlir/lib/Transforms/NormalizeMemRefs.cpp b/mlir/lib/Transforms/NormalizeMemRefs.cpp
--- a/mlir/lib/Transforms/NormalizeMemRefs.cpp
+++ b/mlir/lib/Transforms/NormalizeMemRefs.cpp
@@ -17,6 +17,7 @@
 #include "mlir/Transforms/Passes.h"
 #include "mlir/Transforms/Utils.h"
 #include "llvm/ADT/SmallSet.h"
+#include "llvm/Support/Debug.h"
 
 #define DEBUG_TYPE "normalize-memrefs"