diff --git a/swift/internal/swift_toolchain.bzl b/swift/internal/swift_toolchain.bzl
index d52efab7b..2a1173c45 100644
--- a/swift/internal/swift_toolchain.bzl
+++ b/swift/internal/swift_toolchain.bzl
@@ -274,5 +274,6 @@ 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 c06df3686..300aec715 100644
--- a/swift/internal/xcode_swift_toolchain.bzl
+++ b/swift/internal/xcode_swift_toolchain.bzl
@@ -691,5 +691,6 @@ 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,
 )