diff --git a/test/test_helpers.hpp b/test/test_helpers.hpp
index 78d9ab9..a74d044 100644
--- a/test/test_helpers.hpp
+++ b/test/test_helpers.hpp
@@ -5,7 +5,6 @@
 #include <sstream>
 #include <string>
 #include <vector>
-#include <ss/parser.hpp>
 
 #ifdef CMAKE_GITHUB_CI
 #include <doctest/doctest.h>
@@ -13,6 +12,11 @@
 #include <doctest.h>
 #endif
 
+namespace ss {
+template <typename... Ts>
+class parser;
+} /* ss */
+
 namespace {
 struct buffer {
     std::string data_;
@@ -185,5 +189,4 @@ std::tuple<ss::parser<Ts...>, std::string> make_parser(
         }
     }
 }
-
 } /* namespace */