diff --git a/Sources/Tracing/TracerProtocol+Legacy.swift b/Sources/Tracing/TracerProtocol+Legacy.swift
index 2424e32..79b61b1 100644
--- a/Sources/Tracing/TracerProtocol+Legacy.swift
+++ b/Sources/Tracing/TracerProtocol+Legacy.swift
@@ -404,7 +404,7 @@ extension LegacyTracer {
         _ operationName: String,
         context: @autoclosure () -> ServiceContext = .current ?? .topLevel,
         ofKind kind: SpanKind = .internal,
-        isolation: (any Actor)? = #isolation,
+        isolation: isolated (any Actor)? = #isolation,
         function: String = #function,
         file fileID: String = #fileID,
         line: UInt = #line,
@@ -610,7 +610,7 @@ extension Tracer {
         at instant: @autoclosure () -> some TracerInstant = DefaultTracerClock.now,
         context: @autoclosure () -> ServiceContext = .current ?? .topLevel,
         ofKind kind: SpanKind = .internal,
-        isolation: (any Actor)? = #isolation,
+        isolation: isolated (any Actor)? = #isolation,
         function: String = #function,
         file fileID: String = #fileID,
         line: UInt = #line,
diff --git a/Sources/Tracing/TracerProtocol.swift b/Sources/Tracing/TracerProtocol.swift
index e034d25..ad71791 100644
--- a/Sources/Tracing/TracerProtocol.swift
+++ b/Sources/Tracing/TracerProtocol.swift
@@ -263,7 +263,7 @@ extension Tracer {
         _ operationName: String,
         context: @autoclosure () -> ServiceContext = .current ?? .topLevel,
         ofKind kind: SpanKind = .internal,
-        isolation: (any Actor)? = #isolation,
+        isolation: isolated (any Actor)? = #isolation,
         function: String = #function,
         file fileID: String = #fileID,
         line: UInt = #line,
@@ -353,7 +353,7 @@ extension Tracer {
         context: @autoclosure () -> ServiceContext = .current ?? .topLevel,
         ofKind kind: SpanKind = .internal,
         at instant: @autoclosure () -> some TracerInstant = DefaultTracerClock.now,
-        isolation: (any Actor)? = #isolation,
+        isolation: isolated (any Actor)? = #isolation,
         function: String = #function,
         file fileID: String = #fileID,
         line: UInt = #line,