diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index b538de6..ccc8d7c 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -1787,7 +1787,7 @@
   };
 
 #ifndef NDEBUG
-  void dumpTreeCosts(TreeEntry *E, InstructionCost ReuseShuffleCost,
+  void dumpTreeCosts(const TreeEntry *E, InstructionCost ReuseShuffleCost,
                      InstructionCost VecCost,
                      InstructionCost ScalarCost) const {
     dbgs() << "SLP: Calculated costs for Tree:\n"; E->dump();