diff --git a/Sources/SkipBuild/Commands/SkipstoneCommand.swift b/Sources/SkipBuild/Commands/SkipstoneCommand.swift
index 6cb53cb1..a889dc4d 100644
--- a/Sources/SkipBuild/Commands/SkipstoneCommand.swift
+++ b/Sources/SkipBuild/Commands/SkipstoneCommand.swift
@@ -687,7 +687,7 @@ struct SkipstoneCommand: BuildPluginOptionsCommand, StreamingCommand {
                 let testHarnessOutputPath = try AbsolutePath(validating: testHarnessOutput)
                 let harnessContents = """
                 // Auto-generated by Skip — do not edit
-                #if os(macOS) || os(Linux) // Skip transpiled tests only run on supported hosts
+                #if os(macOS) || targetEnvironment(macCatalyst) || os(Linux) // Skip transpiled tests only run on supported hosts
                 import Foundation
                 import XCTest
                 import SkipTest