diff --git a/src/compiler/compat-blocks.js b/src/compiler/compat-blocks.js
index d8643e3c..17c7c3b7 100644
--- a/src/compiler/compat-blocks.js
+++ b/src/compiler/compat-blocks.js
@@ -8,6 +8,7 @@ const stacked = [
     'control_clear_counter',
     'control_get_counter',
     'control_incr_counter',
+    'looks_switchbackdroptoandwait',
     'looks_changeeffectby',
     'looks_nextbackdrop',
     'looks_nextcostume',