diff --git a/Sources/Build/BuildOperationBuildSystemDelegateHandler.swift b/Sources/Build/BuildOperationBuildSystemDelegateHandler.swift
index b42a407dc19..4f362eefee9 100644
--- a/Sources/Build/BuildOperationBuildSystemDelegateHandler.swift
+++ b/Sources/Build/BuildOperationBuildSystemDelegateHandler.swift
@@ -517,7 +517,7 @@ final class WriteAuxiliaryFileCommand: CustomLLBuildCommand {
         }
 
         do {
-            try self.context.fileSystem.writeFileContents(outputFilePath, string: getFileContents(tool: tool))
+            try self.context.fileSystem.writeIfChanged(path: outputFilePath, string: getFileContents(tool: tool))
             return true
         } catch {
             self.context.observabilityScope.emit(error: "failed to write auxiliary file '\(outputFilePath.pathString)': \(error.interpolationDescription)")
diff --git a/Sources/Workspace/Workspace+State.swift b/Sources/Workspace/Workspace+State.swift
index b54ab25cb71..338c556c8c8 100644
--- a/Sources/Workspace/Workspace+State.swift
+++ b/Sources/Workspace/Workspace+State.swift
@@ -135,7 +135,7 @@ fileprivate struct WorkspaceStateStorage {
             let storage = V6(dependencies: dependencies, artifacts: artifacts)
 
             let data = try self.encoder.encode(storage)
-            try self.fileSystem.writeFileContents(self.path, data: data)
+            try self.fileSystem.writeIfChanged(path: self.path, bytes: .init(data))
         }
     }