diff --git a/compiler-rt/test/fuzzer/cross_over.test b/compiler-rt/test/fuzzer/cross_over.test
--- a/compiler-rt/test/fuzzer/cross_over.test
+++ b/compiler-rt/test/fuzzer/cross_over.test
@@ -1,3 +1,5 @@
+# ios_run.py incorrectly parses this file (rdar://99889376)
+XFAIL: ios && !iossim
 # Tests CrossOverTest.
 # We want to make sure that the test can find the input
 # ABCDEFGHIJ when given two other inputs in the seed corpus:
diff --git a/compiler-rt/test/fuzzer/merge-control-file.test b/compiler-rt/test/fuzzer/merge-control-file.test
--- a/compiler-rt/test/fuzzer/merge-control-file.test
+++ b/compiler-rt/test/fuzzer/merge-control-file.test
@@ -1,4 +1,5 @@
-XFAIL: ios
+# ios_run.py incorrectly parses this file (rdar://99889376)
+XFAIL: ios && !iossim
 RUN: mkdir -p %t
 # Use a ".exe" extension because it is needed on Windows to call system()
 # to execute itself again.