diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -3277,11 +3277,10 @@
       !(isTargetIPhoneOS() && isIPhoneOSVersionLT(5, 0)))
     Res |= SanitizerKind::Vptr;
 
-  if ((IsX86_64 || IsAArch64) && isTargetMacOSBased()) {
+  if ((IsX86_64 || IsAArch64) &&
+      (isTargetMacOSBased() || isTargetIOSSimulator() ||
+       isTargetTvOSSimulator() || isTargetWatchOSSimulator())) {
     Res |= SanitizerKind::Thread;
-  } else if (isTargetIOSSimulator() || isTargetTvOSSimulator()) {
-    if (IsX86_64)
-      Res |= SanitizerKind::Thread;
   }
   return Res;
 }
diff --git a/clang/test/Driver/fsanitize.c b/clang/test/Driver/fsanitize.c
--- a/clang/test/Driver/fsanitize.c
+++ b/clang/test/Driver/fsanitize.c
@@ -460,9 +460,21 @@
 // RUN: %clang --target=arm64-apple-macos -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-ARM64-MACOS
 // CHECK-TSAN-ARM64-MACOS-NOT: unsupported option
 
+// RUN: %clang --target=arm64-apple-ios-simulator -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-ARM64-IOSSIMULATOR
+// CHECK-TSAN-ARM64-IOSSIMULATOR-NOT: unsupported option
+
+// RUN: %clang --target=arm64-apple-watchos-simulator -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-ARM64-WATCHOSSIMULATOR
+// CHECK-TSAN-ARM64-WATCHOSSIMULATOR-NOT: unsupported option
+
+// RUN: %clang --target=arm64-apple-tvos-simulator -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-ARM64-TVOSSIMULATOR
+// CHECK-TSAN-ARM64-TVOSSIMULATOR-NOT: unsupported option
+
 // RUN: %clang --target=x86_64-apple-ios-simulator -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-X86-64-IOSSIMULATOR
 // CHECK-TSAN-X86-64-IOSSIMULATOR-NOT: unsupported option
 
+// RUN: %clang --target=x86_64-apple-watchos-simulator -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-X86-64-WATCHOSSIMULATOR
+// CHECK-TSAN-X86-64-WATCHOSSIMULATOR-NOT: unsupported option
+
 // RUN: %clang --target=x86_64-apple-tvos-simulator -fsanitize=thread %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-TSAN-X86-64-TVOSSIMULATOR
 // CHECK-TSAN-X86-64-TVOSSIMULATOR-NOT: unsupported option