diff --git a/include/simdjson/generic/ondemand/array_iterator.h b/include/simdjson/generic/ondemand/array_iterator.h
index 0c1c0ad0..de06e614 100644
--- a/include/simdjson/generic/ondemand/array_iterator.h
+++ b/include/simdjson/generic/ondemand/array_iterator.h
@@ -4,6 +4,7 @@ namespace simdjson {
 namespace SIMDJSON_IMPLEMENTATION {
 namespace ondemand {
 
+class array;
 class value;
 class document;
 
diff --git a/include/simdjson/generic/ondemand/json_iterator.h b/include/simdjson/generic/ondemand/json_iterator.h
index 6a08f70a..e82040ce 100644
--- a/include/simdjson/generic/ondemand/json_iterator.h
+++ b/include/simdjson/generic/ondemand/json_iterator.h
@@ -2,6 +2,12 @@ namespace simdjson {
 namespace SIMDJSON_IMPLEMENTATION {
 namespace ondemand {
 
+class document;
+class object;
+class array;
+class value;
+class raw_json_string;
+class parser;
 class json_iterator_ref;
 
 /**
diff --git a/include/simdjson/generic/ondemand/raw_json_string.h b/include/simdjson/generic/ondemand/raw_json_string.h
index 52bb67a2..e3df89e9 100644
--- a/include/simdjson/generic/ondemand/raw_json_string.h
+++ b/include/simdjson/generic/ondemand/raw_json_string.h
@@ -4,6 +4,7 @@ namespace simdjson {
 namespace SIMDJSON_IMPLEMENTATION {
 namespace ondemand {
 
+class object;
 class parser;
 
 /**