1 files changed, 1 insertions, 0 deletions
diff --git a/libsolidity/ast/ASTForward.h b/libsolidity/ast/ASTForward.h
index 02dd054a..6aaa77ce 100644
--- a/libsolidity/ast/ASTForward.h
+++ b/libsolidity/ast/ASTForward.h
@@ -39,6 +39,7 @@ class ImportDirective;
 class Declaration;
 class ContractDefinition;
 class InheritanceSpecifier;
+class UsingForDirective;
 class StructDefinition;
 class EnumDefinition;
 class EnumValue;