diff --git a/Sources/XcodeGenKit/PBXProjGenerator.swift b/Sources/XcodeGenKit/PBXProjGenerator.swift
index dcf7d7e4..35e73f3e 100644
--- a/Sources/XcodeGenKit/PBXProjGenerator.swift
+++ b/Sources/XcodeGenKit/PBXProjGenerator.swift
@@ -574,7 +574,7 @@ public class PBXProjGenerator {
         func getBuildFilesForSourceFiles(_ sourceFiles: [SourceFile]) -> [PBXBuildFile] {
             let files = sourceFiles
                 .reduce(into: [SourceFile]()) { output, sourceFile in
-                    if !output.contains(where: { $0.fileReference == sourceFile.fileReference }) {
+                    if !output.contains(where: { $0.fileReference === sourceFile.fileReference }) {
                         output.append(sourceFile)
                     }
                 }
diff --git a/Tests/XcodeGenKitTests/SourceGeneratorTests.swift b/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
index e4a0440e..7dec0a53 100644
--- a/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
+++ b/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
@@ -534,7 +534,7 @@ extension PBXProj {
 
         if let buildPhase = buildPhase {
             let buildFile = buildFiles
-                .first(where: { $0.file == fileReference })
+                .first(where: { $0.file === fileReference })
             let actualBuildPhase = buildFile
                 .flatMap { buildFile in buildPhases.first { $0.files.contains(buildFile) } }?.buildPhase