1 files changed, 3 insertions, 1 deletions
diff --git a/lib/DebugInfo/PDB/PDBSymbolThunk.cpp b/lib/DebugInfo/PDB/PDBSymbolThunk.cpp
index ef8897d12af4..b2648197f9cc 100644
--- a/lib/DebugInfo/PDB/PDBSymbolThunk.cpp
+++ b/lib/DebugInfo/PDB/PDBSymbolThunk.cpp
@@ -18,6 +18,8 @@ using namespace llvm::pdb;
 
 PDBSymbolThunk::PDBSymbolThunk(const IPDBSession &PDBSession,
                                std::unique_ptr<IPDBRawSymbol> Symbol)
-    : PDBSymbol(PDBSession, std::move(Symbol)) {}
+    : PDBSymbol(PDBSession, std::move(Symbol)) {
+  assert(RawSymbol->getSymTag() == PDB_SymType::Thunk);
+}
 
 void PDBSymbolThunk::dump(PDBSymDumper &Dumper) const { Dumper.dump(*this); }