diff --git a/Source/Core/Core/IOS/ES/Formats.cpp b/Source/Core/Core/IOS/ES/Formats.cpp
index 8790dd2ff1..214fd8a31f 100644
--- a/Source/Core/Core/IOS/ES/Formats.cpp
+++ b/Source/Core/Core/IOS/ES/Formats.cpp
@@ -61,6 +61,11 @@ bool Content::IsShared() const
   return (type & 0x8000) != 0;
 }
 
+bool Content::IsOptional() const
+{
+  return (type & 0x4000) != 0;
+}
+
 SignedBlobReader::SignedBlobReader(const std::vector<u8>& bytes) : m_bytes(bytes)
 {
 }
diff --git a/Source/Core/Core/IOS/ES/Formats.h b/Source/Core/Core/IOS/ES/Formats.h
index 943f93d8da..dd1352b367 100644
--- a/Source/Core/Core/IOS/ES/Formats.h
+++ b/Source/Core/Core/IOS/ES/Formats.h
@@ -83,6 +83,7 @@ static_assert(sizeof(TMDHeader) == 0x1e4, "TMDHeader has the wrong size");
 struct Content
 {
   bool IsShared() const;
+  bool IsOptional() const;
   u32 id;
   u16 index;
   u16 type;
diff --git a/Source/Core/Core/IOS/ES/TitleManagement.cpp b/Source/Core/Core/IOS/ES/TitleManagement.cpp
index 7a41fd1c88..143c4a86d3 100644
--- a/Source/Core/Core/IOS/ES/TitleManagement.cpp
+++ b/Source/Core/Core/IOS/ES/TitleManagement.cpp
@@ -350,7 +350,25 @@ IPCCommandResult ES::ImportContentEnd(Context& context, const IOCtlVRequest& req
 
 ReturnCode ES::ImportTitleDone(Context& context)
 {
-  if (!context.title_import.tmd.IsValid())
+  if (!context.title_import.tmd.IsValid() || context.title_import.content_id != 0xFFFFFFFF)
+    return ES_EINVAL;
+
+  // Make sure all listed, non-optional contents have been imported.
+  const u64 title_id = context.title_import.tmd.GetTitleId();
+  const std::vector<IOS::ES::Content> contents = context.title_import.tmd.GetContents();
+  const IOS::ES::SharedContentMap shared_content_map{Common::FROM_SESSION_ROOT};
+  const bool has_all_required_contents =
+      std::all_of(contents.cbegin(), contents.cend(), [&](const IOS::ES::Content& content) {
+        if (content.IsOptional())
+          return true;
+
+        if (content.IsShared())
+          return shared_content_map.GetFilenameFromSHA1(content.sha1).has_value();
+
+        return File::Exists(Common::GetTitleContentPath(title_id, Common::FROM_SESSION_ROOT) +
+                            StringFromFormat("%08x.app", content.id));
+      });
+  if (!has_all_required_contents)
     return ES_EINVAL;
 
   if (!WriteImportTMD(context.title_import.tmd))
@@ -359,7 +377,7 @@ ReturnCode ES::ImportTitleDone(Context& context)
   if (!FinishImport(context.title_import.tmd))
     return ES_EIO;
 
-  INFO_LOG(IOS_ES, "ImportTitleDone: title %016" PRIx64, context.title_import.tmd.GetTitleId());
+  INFO_LOG(IOS_ES, "ImportTitleDone: title %016" PRIx64, title_id);
   context.title_import.tmd.SetBytes({});
   return IPC_SUCCESS;
 }