diff --git a/include/xo/reader2/SchematikaReader.hpp b/include/xo/reader2/SchematikaReader.hpp
index 58c77ec8..de3da42f 100644
--- a/include/xo/reader2/SchematikaReader.hpp
+++ b/include/xo/reader2/SchematikaReader.hpp
@@ -12,10 +12,14 @@
 namespace xo {
     namespace scm {
         struct ReaderResult {
+            using ACollector = xo::mm::ACollector;
             using span_type = xo::mm::span<const char>;
 
             bool is_tk_error() const { return tk_error_.is_error(); }
 
+            /** forward gc-aware pointers (called during gc cycle) **/
+            void forward_children(obj<ACollector> gc) noexcept;
+
             /** schematika expression parsed from input **/
             obj<AExpression> expr_;
             /** unconsumed portion of input span
@@ -35,6 +39,7 @@ namespace xo {
          **/
         class SchematikaReader {
         public:
+            using ACollector = xo::mm::ACollector;
             using AAllocator = xo::mm::AAllocator;
             using MemorySizeVisitor = xo::mm::MemorySizeVisitor;
             using span_type = xo::mm::span<const char>;
@@ -101,6 +106,9 @@ namespace xo {
              **/
             void reset_to_idle_toplevel();
 
+            /** update gc-aware child pointers **/
+            void forward_children(obj<ACollector> gc) noexcept;
+
         private:
             /** tokenizer converts a stream of chars
              *  to a stream of lexical tokens
diff --git a/src/reader2/SchematikaReader.cpp b/src/reader2/SchematikaReader.cpp
index 0db3f337..ba681bab 100644
--- a/src/reader2/SchematikaReader.cpp
+++ b/src/reader2/SchematikaReader.cpp
@@ -9,6 +9,14 @@ namespace xo {
     using xo::mm::MemorySizeInfo;
 
     namespace scm {
+        void
+        ReaderResult::forward_children(obj<ACollector> gc) noexcept
+        {
+            gc.forward_pivot_inplace(&expr_);
+        }
+
+        // ----- SchematikaReader -----
+
         SchematikaReader::SchematikaReader(const ReaderConfig & config,
                                            obj<AAllocator> expr_alloc,
                                            obj<AAllocator> aux_alloc)
@@ -198,6 +206,16 @@ namespace xo {
             this->tokenizer_.discard_current_line();
             this->parser_.reset_to_idle_toplevel();
         }
+
+        void
+        SchematikaReader::forward_children(obj<ACollector> gc) noexcept
+        {
+            // tokenizer doesn't contain any gc-aware pointers.
+
+            parser_.forward_children(gc);
+            result_.forward_children(gc);
+        }
+
     } /*namespace scm*/
 } /*namespace xo*/