diff --git a/llvm/lib/CodeGen/LexicalScopes.cpp b/llvm/lib/CodeGen/LexicalScopes.cpp
index 3e97836..938fa0a 100644
--- a/llvm/lib/CodeGen/LexicalScopes.cpp
+++ b/llvm/lib/CodeGen/LexicalScopes.cpp
@@ -157,8 +157,8 @@
                                                     false)).first;
 
   if (!Parent) {
-    assert(DIDescriptor(Scope).isSubprogram());
-    assert(DISubprogram(Scope).describes(MF->getFunction()));
+    assert(
+        DISubprogram(cast<MDSubprogram>(Scope)).describes(MF->getFunction()));
     assert(!CurrentFnLexicalScope);
     CurrentFnLexicalScope = &I->second;
   }