diff --git a/tools/dsymutil/DwarfLinker.cpp b/tools/dsymutil/DwarfLinker.cpp
index 95f4ae4dc0d..997808d12a3 100644
--- a/tools/dsymutil/DwarfLinker.cpp
+++ b/tools/dsymutil/DwarfLinker.cpp
@@ -2884,15 +2884,13 @@ void DwarfLinker::patchLineTableForUnit(CompileUnit &Unit,
       if (StopAddress != -1ULL && !Seq.empty()) {
         // Insert end sequence row with the computed end address, but
         // the same line as the previous one.
-        // Do not collapse the next two statements as the push_back operation
-        // may reallocate the vector and invalidate the iterator Seq.back().
         auto NextLine = Seq.back();
-        Seq.push_back(NextLine);
         Seq.back().Address = StopAddress;
         Seq.back().EndSequence = 1;
         Seq.back().PrologueEnd = 0;
         Seq.back().BasicBlock = 0;
         Seq.back().EpilogueBegin = 0;
+        Seq.push_back(NextLine);
         insertLineSequence(Seq, NewRows);
       }