diff --git a/llvm/include/llvm/Support/TargetRegistry.h b/llvm/include/llvm/Support/TargetRegistry.h
index 30292b3561422..d91eabae82357 100644
--- a/llvm/include/llvm/Support/TargetRegistry.h
+++ b/llvm/include/llvm/Support/TargetRegistry.h
@@ -474,7 +474,7 @@ class Target {
                                      const MCSubtargetInfo &STI, bool RelaxAll,
                                      bool IncrementalLinkerCompatible,
                                      bool DWARFMustBeAtTheEnd) const {
-    MCStreamer *S;
+    MCStreamer *S = nullptr;
     switch (T.getObjectFormat()) {
     case Triple::UnknownObjectFormat:
       llvm_unreachable("Unknown object format");