diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index 05afcbee701a8..4ab6fc2ddc28c 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -3228,7 +3228,7 @@ struct VRegFilter {
   // worst-case memory usage within 2x of figures determined empirically for
   // "all Dense" scenario in such worst-by-execution-time cases.
   BitVector Sparse;
-  DenseSet<unsigned> Dense;
+  DenseSet<Register> Dense;
 };
 
 // Implements both a transfer function and a (binary, in-place) join operator