diff --git a/src/main.cc b/src/main.cc
index c3062a1..3d798d4 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -245,10 +245,10 @@ void construct_block_blob_fa(const Nan::FunctionCallbackInfo<v8::Value>& info) {
         block parent_block;
         b.parent_block.nonce = nonce;
         if (!construct_parent_block(b, parent_block))
-            return except("Failed to construct parent block");
+            return THROW_ERROR_EXCEPTION("Failed to construct parent block");
 
         if (!mergeBlocks(parent_block, b, std::vector<crypto::hash>()))
-            return except("Failed to postprocess mining block");
+            return THROW_ERROR_EXCEPTION("Failed to postprocess mining block");
     }
 
     if (!block_to_blob(b, output))