diff --git a/Sources/ProjectSpec/ProjectSpec.swift b/Sources/ProjectSpec/ProjectSpec.swift
index 32554a19..38c77795 100644
--- a/Sources/ProjectSpec/ProjectSpec.swift
+++ b/Sources/ProjectSpec/ProjectSpec.swift
@@ -97,7 +97,8 @@ extension ProjectSpec: Equatable {
 extension ProjectSpec.Options: Equatable {
 
     public static func ==(lhs: ProjectSpec.Options, rhs: ProjectSpec.Options) -> Bool {
-        return lhs.carthageBuildPath == rhs.carthageBuildPath
+        return lhs.carthageBuildPath == rhs.carthageBuildPath &&
+        lhs.bundleIdPrefix == rhs.bundleIdPrefix
     }
 }