diff --git a/compiler-rt/test/sanitizer_common/ios_commands/iossim_run.py b/compiler-rt/test/sanitizer_common/ios_commands/iossim_run.py
index 47b847f5329c..63a75240b542 100755
--- a/compiler-rt/test/sanitizer_common/ios_commands/iossim_run.py
+++ b/compiler-rt/test/sanitizer_common/ios_commands/iossim_run.py
@@ -8,7 +8,7 @@ if not "SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER" in os.environ:
 
 device_id = os.environ["SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER"]
 
-for e in ["ASAN_OPTIONS", "TSAN_OPTIONS"]:
+for e in ["ASAN_OPTIONS", "TSAN_OPTIONS", "UBSAN_OPTIONS"]:
   if e in os.environ:
     os.environ["SIMCTL_CHILD_" + e] = os.environ[e]