diff --git a/core/tests/regression_tests.rs b/core/tests/regression_tests.rs
index 3f969d516..66787763b 100644
--- a/core/tests/regression_tests.rs
+++ b/core/tests/regression_tests.rs
@@ -34,6 +34,7 @@ macro_rules! swf_tests {
 // Inside the folder is expected to be "test.swf" and "output.txt" with the correct output.
 swf_tests! {
     (add_property, "avm1/add_property", 1),
+    (as_transformed_flag, "avm1/as_transformed_flag", 3),
     (do_init_action, "avm1/do_init_action", 3),
     (execution_order1, "avm1/execution_order1", 3),
     (execution_order2, "avm1/execution_order2", 15),
diff --git a/core/tests/swfs/avm1/as_transformed_flag/output.txt b/core/tests/swfs/avm1/as_transformed_flag/output.txt
new file mode 100644
index 000000000..a0b811a8f
--- /dev/null
+++ b/core/tests/swfs/avm1/as_transformed_flag/output.txt
@@ -0,0 +1,4 @@
+50
+50
+0
+undefined
diff --git a/core/tests/swfs/avm1/as_transformed_flag/test.fla b/core/tests/swfs/avm1/as_transformed_flag/test.fla
new file mode 100644
index 000000000..3859b4a5d
Binary files /dev/null and b/core/tests/swfs/avm1/as_transformed_flag/test.fla differ
diff --git a/core/tests/swfs/avm1/as_transformed_flag/test.swf b/core/tests/swfs/avm1/as_transformed_flag/test.swf
new file mode 100644
index 000000000..1ff8c3e38
Binary files /dev/null and b/core/tests/swfs/avm1/as_transformed_flag/test.swf differ