diff --git a/swift/internal/swift_toolchain.bzl b/swift/internal/swift_toolchain.bzl
index d752e9107..40e0ee879 100644
--- a/swift/internal/swift_toolchain.bzl
+++ b/swift/internal/swift_toolchain.bzl
@@ -275,5 +275,6 @@ for incremental compilation using a persistent mode.
     doc = "Represents a Swift compiler toolchain.",
     fragments = ["swift"],
     toolchains = ["@bazel_tools//tools/cpp:toolchain_type"],
+    incompatible_use_toolchain_transition = True,
     implementation = _swift_toolchain_impl,
 )
diff --git a/swift/internal/xcode_swift_toolchain.bzl b/swift/internal/xcode_swift_toolchain.bzl
index 0c60d2b91..4e0209835 100644
--- a/swift/internal/xcode_swift_toolchain.bzl
+++ b/swift/internal/xcode_swift_toolchain.bzl
@@ -692,5 +692,6 @@ for incremental compilation using a persistent mode.
         "swift",
     ],
     toolchains = ["@bazel_tools//tools/cpp:toolchain_type"],
+    incompatible_use_toolchain_transition = True,
     implementation = _xcode_swift_toolchain_impl,
 )