diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index befeb38e1fe5bc..df0d6908d0a782 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -6447,7 +6447,7 @@ bool Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs(
   if (Inst.isInvalid())
     return false;
 
-  bool AtLeastAsSpecialized;
+  bool AtLeastAsSpecialized = false;
   runWithSufficientStackSpace(Info.getLocation(), [&] {
     AtLeastAsSpecialized =
         ::FinishTemplateArgumentDeduction(