diff --git a/GeminiLanguageModel/Sources/GeminiLanguageModel/GeminiTranscriptTranslator.swift b/GeminiLanguageModel/Sources/GeminiLanguageModel/GeminiTranscriptTranslator.swift
index 40e3892dbe..a96214fe1a 100644
--- a/GeminiLanguageModel/Sources/GeminiLanguageModel/GeminiTranscriptTranslator.swift
+++ b/GeminiLanguageModel/Sources/GeminiLanguageModel/GeminiTranscriptTranslator.swift
@@ -152,14 +152,14 @@
             }
           }
 
-        // `Transcript.Entry.data` was added in the Xcode 27.2 SDK (FoundationModels 2.1).
-        #if canImport(FoundationModels, _version: 2.1)
+        // `Transcript.Entry.data` was added in Xcode 27.2 (Swift 6.4.2+).
+        #if compiler(>=6.4.2)
           case .data:
             throw makeUnsupportedError(
               entry,
               description: "Data transcript entries are not supported."
             )
-        #endif  // canImport(FoundationModels, _version: 2.1)
+        #endif  // compiler(>=6.4.2)
 
         @unknown default:
           throw makeUnsupportedError(
diff --git a/GeminiLanguageModel/Tests/GeminiLanguageModelTests/GeminiTranscriptTranslatorTests.swift b/GeminiLanguageModel/Tests/GeminiLanguageModelTests/GeminiTranscriptTranslatorTests.swift
index 0546422d41..638e5503c3 100644
--- a/GeminiLanguageModel/Tests/GeminiLanguageModelTests/GeminiTranscriptTranslatorTests.swift
+++ b/GeminiLanguageModel/Tests/GeminiLanguageModelTests/GeminiTranscriptTranslatorTests.swift
@@ -675,7 +675,8 @@
       }
     }
 
-    #if canImport(FoundationModels, _version: 2.1)
+    // `Transcript.Entry.data` was added in Xcode 27.2 (Swift 6.4.2+).
+    #if compiler(>=6.4.2)
       @Test
       @available(macOS 27.2, iOS 27.2, watchOS 27.2, visionOS 27.2, *)
       @available(tvOS, unavailable)
@@ -696,7 +697,7 @@
           Issue.record("Unexpected error thrown: \(error)")
         }
       }
-    #endif  // canImport(FoundationModels, _version: 2.1)
+    #endif  // compiler(>=6.4.2)
 
     @Test
     @available(macOS 27.0, iOS 27.0, watchOS 27.0, visionOS 27.0, *)