diff --git a/gen/functions.cpp b/gen/functions.cpp
index 238b0df5..b8d70f0c 100644
--- a/gen/functions.cpp
+++ b/gen/functions.cpp
@@ -613,11 +613,12 @@ static void set_param_attrs(TypeFunction* f, llvm::Function* func, FuncDeclarati
 #endif
     for (size_t i = 0; i < oldAttrs.getNumSlots(); ++i) {
 #if LDC_LLVM_VER >= 303
-        llvm::AttributeWithIndex curr = llvm::AttributeWithIndex::get(oldAttrs.getSlotIndex(i),
+        const unsigned Index = oldAttrs.getSlotIndex(i);
+        llvm::AttrBuilder &builder = llvm::AttrBuilder(oldAttrs.getSlotAttributes(i), Index).addAttribute(llvm::Attribute::None);
+        llvm::AttributeWithIndex curr = llvm::AttributeWithIndex::get(Index,
                                                                       llvm::Attribute::get(
                                                                           gIR->context(),
-                                                                          llvm::AttrBuilder(oldAttrs.getSlotAttributes(i),
-                                                                                            oldAttrs.getSlotIndex(i))));
+                                                                          builder));
 #else
         llvm::AttributeWithIndex curr = oldAttrs.getSlot(i);
 #endif