diff --git a/benchmark/cxx-source/CxxSetToCollection.swift b/benchmark/cxx-source/CxxSetToCollection.swift
index 5a9e9904ba706..4af092075982d 100644
--- a/benchmark/cxx-source/CxxSetToCollection.swift
+++ b/benchmark/cxx-source/CxxSetToCollection.swift
@@ -13,6 +13,8 @@
 // This is a benchmark that tracks how quickly Swift can convert a C++ set
 // to a Swift collection.
 
+/* FIXME: rdar://150067288
+
 import TestsUtils
 import CxxStdlibPerformance
 import Cxx
@@ -64,3 +66,5 @@ public func run_CxxSetOfU32_forEach(_ n: Int) {
     }
   }
 }
+
+*/
diff --git a/benchmark/cxx-source/CxxStringConversion.swift b/benchmark/cxx-source/CxxStringConversion.swift
index a10418800e269..8ab65a8065ba5 100644
--- a/benchmark/cxx-source/CxxStringConversion.swift
+++ b/benchmark/cxx-source/CxxStringConversion.swift
@@ -10,6 +10,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+/* FIXME: rdar://150067288
+
 import TestsUtils
 import CxxStdlibPerformance
 import CxxStdlib
@@ -58,3 +60,5 @@ public func run_cxxToSwift(_ n: Int) {
     blackHole(x)
   }
 }
+
+*/
diff --git a/benchmark/cxx-source/CxxVectorSum.swift b/benchmark/cxx-source/CxxVectorSum.swift
index ad6d37773e583..c17d5ec22abed 100644
--- a/benchmark/cxx-source/CxxVectorSum.swift
+++ b/benchmark/cxx-source/CxxVectorSum.swift
@@ -13,6 +13,8 @@
 // This is a benchmark that tracks how quickly Swift can sum up a C++ vector
 // as compared to the C++ implementation of such sum.
 
+/* FIXME: rdar://150067288
+
 import TestsUtils
 import CxxStdlibPerformance
 import Cxx
@@ -119,3 +121,5 @@ public func run_CxxVectorOfU32_Sum_Swift_Reduce(_ n: Int) {
     }
     blackHole(sum)
 }
+
+*/