diff --git a/swift/internal/feature_names.bzl b/swift/internal/feature_names.bzl
index f19b52295..e2abe7d0d 100644
--- a/swift/internal/feature_names.bzl
+++ b/swift/internal/feature_names.bzl
@@ -325,6 +325,10 @@ SWIFT_FEATURE_OBJC_LINK_FLAGS = "swift.objc_link_flag"
 # all Swift compilations to always be linked.
 SWIFT_FEATURE__FORCE_ALWAYSLINK_TRUE = "swift._force_alwayslink_true"
 
+# If enabled, requests the `-enforce-exclusivity=checked` swiftc flag which
+# enables runtime checking of exclusive memory access on mutation.
+SWIFT_FEATURE_CHECKED_EXCLUSIVITY = "swift.checked_exclusivity"
+
 # Disables Swift sandbox which prevents issues with nested sandboxing when Swift code contains system-provided macros.
 # If enabled '#Preview' macro provided by SwiftUI fails to build and probably other system-provided macros.
 # Enabled by default for Swift 5.10+ on macOS.
diff --git a/swift/toolchains/config/compile_config.bzl b/swift/toolchains/config/compile_config.bzl
index d5be70b43..18c4d03d5 100644
--- a/swift/toolchains/config/compile_config.bzl
+++ b/swift/toolchains/config/compile_config.bzl
@@ -34,6 +34,7 @@ load(
 load(
     "//swift/internal:feature_names.bzl",
     "SWIFT_FEATURE_CACHEABLE_SWIFTMODULES",
+    "SWIFT_FEATURE_CHECKED_EXCLUSIVITY",
     "SWIFT_FEATURE_CODEVIEW_DEBUG_INFO",
     "SWIFT_FEATURE_COVERAGE",
     "SWIFT_FEATURE_COVERAGE_PREFIX_MAP",
@@ -249,6 +250,13 @@ def compile_action_configs(
             configurators = [_emit_objc_header_path_configurator],
         ),
 
+        # Configure enforce exclusivity checks if enabled.
+        ActionConfigInfo(
+            actions = [SWIFT_ACTION_COMPILE],
+            configurators = [add_arg("-enforce-exclusivity=checked")],
+            features = [SWIFT_FEATURE_CHECKED_EXCLUSIVITY],
+        ),
+
         # Configure Const value extraction.
         ActionConfigInfo(
             actions = [SWIFT_ACTION_COMPILE],