diff --git a/src/sem/type_mappings.h b/src/sem/type_mappings.h
index 073ff13200..ecc6ea3501 100644
--- a/src/sem/type_mappings.h
+++ b/src/sem/type_mappings.h
@@ -41,6 +41,7 @@ class Call;
 class Expression;
 class Function;
 class MemberAccessorExpression;
+class Node;
 class Statement;
 class Struct;
 class StructMember;