1 files changed, 5 insertions, 0 deletions
diff --git a/py/mpstate.h b/py/mpstate.h
index 07335bae4c..53b2906872 100644
--- a/py/mpstate.h
+++ b/py/mpstate.h
@@ -231,6 +231,11 @@ typedef struct _mp_state_vm_t {
     // This is a global mutex used to make the VM/runtime thread-safe.
     mp_thread_mutex_t gil_mutex;
     #endif
+
+    #if MICROPY_OPT_MAP_LOOKUP_CACHE
+    // See mp_map_lookup.
+    uint8_t map_lookup_cache[MICROPY_OPT_MAP_LOOKUP_CACHE_SIZE];
+    #endif
 } mp_state_vm_t;
 
 // This structure holds state that is specific to a given thread.