diff --git a/tests/test_ASTNodeDataType.cpp b/tests/test_ASTNodeDataType.cpp
index 643cc51ce2e70fff3f8c0ebee26300d20d82a88b..5a7b09eb32ace24066a3264d1acb055c33364dc7 100644
--- a/tests/test_ASTNodeDataType.cpp
+++ b/tests/test_ASTNodeDataType.cpp
@@ -1,5 +1,6 @@
 #include <catch2/catch.hpp>
 
+#include <language/PEGGrammar.hpp>
 #include <language/ast/ASTNode.hpp>
 #include <language/ast/ASTNodeDataType.hpp>
 
diff --git a/tests/test_ASTNodeNaturalConversionChecker.cpp b/tests/test_ASTNodeNaturalConversionChecker.cpp
index f37a58b410fd2b4213457f00f3336ae626c4c428..1470dfc7f183c1bc802cffdc202b9e2d6f75fd95 100644
--- a/tests/test_ASTNodeNaturalConversionChecker.cpp
+++ b/tests/test_ASTNodeNaturalConversionChecker.cpp
@@ -1,5 +1,6 @@
 #include <catch2/catch.hpp>
 
+#include <language/PEGGrammar.hpp>
 #include <language/ast/ASTNode.hpp>
 #include <language/ast/ASTNodeNaturalConversionChecker.hpp>