diff --git a/cbackend.cpp b/cbackend.cpp
index 280589ca..e2200555 100644
--- a/cbackend.cpp
+++ b/cbackend.cpp
@@ -3501,6 +3501,7 @@ void CWriter::lowerIntrinsics(llvm::Function &F) {
           case llvm::Intrinsic::uadd_with_overflow:
           case llvm::Intrinsic::sadd_with_overflow:
           case llvm::Intrinsic::trap:
+          case llvm::Intrinsic::objectsize:
               // We directly implement these intrinsics
             break;
           default:
@@ -3820,6 +3821,8 @@ bool CWriter::visitBuiltinCall(llvm::CallInst &I, llvm::Intrinsic::ID ID,
   case llvm::Intrinsic::trap:
     Out << "abort()";
     return true;
+  case llvm::Intrinsic::objectsize:
+    return true;
   }
 }