diff --git a/src/llvm_backend_const.cpp b/src/llvm_backend_const.cpp
index 39e2024b0..aa5696ba3 100644
--- a/src/llvm_backend_const.cpp
+++ b/src/llvm_backend_const.cpp
@@ -754,6 +754,9 @@ gb_internal LLVMValueRef lb_construct_const_union(lbModule *m, LLVMValueRef vari
 			}
 		}
 
+		return nullptr;
+	} else {
+		// TODO(bill): ignore this for the time being
 		return nullptr;
 	}