1 files changed, 4 insertions, 0 deletions
diff --git a/py/emitbc.c b/py/emitbc.c
index 98e1d1bde..6a46cfb59 100644
--- a/py/emitbc.c
+++ b/py/emitbc.c
@@ -331,6 +331,10 @@ void mp_emit_bc_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
             // the highest slot in the state (fastn[0], see vm.c).
             n_state = 1;
         }
+        #if MICROPY_DEBUG_VM_STACK_OVERFLOW
+        // An extra slot in the stack is needed to detect VM stack overflow
+        n_state += 1;
+        #endif
         emit_write_code_info_uint(emit, n_state);
         emit_write_code_info_uint(emit, scope->exc_stack_size);
     }