1 files changed, 6 insertions, 0 deletions
diff --git a/py/mpstate.h b/py/mpstate.h
index 42593e4c40..dd185a7c25 100644
--- a/py/mpstate.h
+++ b/py/mpstate.h
@@ -131,6 +131,12 @@ typedef struct _mp_state_vm_t {
     // END ROOT POINTER SECTION
     ////////////////////////////////////////////////////////////
 
+    // pointer and sizes to store interned string data
+    // (qstr_last_chunk can be root pointer but is also stored in qstr pool)
+    byte *qstr_last_chunk;
+    mp_uint_t qstr_last_alloc;
+    mp_uint_t qstr_last_used;
+
     // Stack top at the start of program
     // Note: this entry is used to locate the end of the root pointer section.
     char *stack_top;