diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index ac0b3fe8e04a..99119bcb2e4e 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -2488,7 +2488,8 @@ static bool isSameTemplateArg(ASTContext &Context,
                                              XPEnd = X.pack_end(),
                                              YP = Y.pack_begin();
              XP != XPEnd; ++XP, ++YP)
-          if (!isSameTemplateArg(Context, *XP, *YP, PackExpansionMatchesPack))
+          if (!isSameTemplateArg(Context, *XP, *YP, PartialOrdering,
+                                 PackExpansionMatchesPack))
             return false;
       } else {
         unsigned PackIterationSize = X.pack_size();