diff --git a/src/main.cc b/src/main.cc
index c581ca8..c3062a1 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -125,7 +125,7 @@ NAN_METHOD(convert_blob_fa) {
     if (!parse_and_validate_block_from_blob(input, b))
         return THROW_ERROR_EXCEPTION("Failed to parse block");
 
-    if (b.major_version < BLOCK_MAJOR_VERSION_3) {
+    if (b.major_version < BLOCK_MAJOR_VERSION_2) {
         if (!get_block_hashing_blob(b, output))
             return THROW_ERROR_EXCEPTION("Failed to create mining block");
     } else {