diff --git a/gen/runtime.cpp b/gen/runtime.cpp
index 3b2f3371..a0ccd41c 100644
--- a/gen/runtime.cpp
+++ b/gen/runtime.cpp
@@ -900,7 +900,7 @@ static void LLVM_D_BuildRuntimeModule()
 
     // void _d_invariant(Object o)
     {
-        llvm::StringRef fname("_d_invariant");
+        llvm::StringRef fname("_D9invariant12_d_invariantFC6ObjectZv");
         LLType *types[] = { objectTy };
         LLFunctionType* fty = llvm::FunctionType::get(voidTy, types, false);
         llvm::Function::Create(fty, llvm::GlobalValue::ExternalLinkage, fname, M);
diff --git a/gen/toir.cpp b/gen/toir.cpp
index d66b5894..afcd17a3 100644
--- a/gen/toir.cpp
+++ b/gen/toir.cpp
@@ -2102,7 +2102,7 @@ DValue* AssertExp::toElem(IRState* p)
         !(static_cast<TypeClass*>(condty)->sym->isInterfaceDeclaration()))
     {
         Logger::println("calling class invariant");
-        llvm::Function* fn = LLVM_D_GetRuntimeFunction(gIR->module, "_d_invariant");
+        llvm::Function* fn = LLVM_D_GetRuntimeFunction(gIR->module, "_D9invariant12_d_invariantFC6ObjectZv");
         LLValue* arg = DtoBitCast(cond->getRVal(), fn->getFunctionType()->getParamType(0));
         gIR->CreateCallOrInvoke(fn, arg);
     }