diff --git a/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp b/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp
index 460d4fccc9..2a5abb8ba4 100644
--- a/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp
+++ b/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp
@@ -331,7 +331,7 @@ error_code sceNpTrophyRegisterContext(ppu_thread& ppu, u32 context, u32 handle,
 
 error_code sceNpTrophyGetRequiredDiskSpace(u32 context, u32 handle, vm::ptr<u64> reqspace, u64 options)
 {
-	sceNpTrophy.todo("sceNpTrophyGetRequiredDiskSpace(context=0x%x, handle=0x%x, reqspace=*0x%x, options=0x%llx)", context, handle, reqspace, options);
+	sceNpTrophy.warning("sceNpTrophyGetRequiredDiskSpace(context=0x%x, handle=0x%x, reqspace=*0x%x, options=0x%llx)", context, handle, reqspace, options);
 
 	if (!reqspace)
 	{
@@ -352,12 +352,18 @@ error_code sceNpTrophyGetRequiredDiskSpace(u32 context, u32 handle, vm::ptr<u64>
 		return SCE_NP_TROPHY_ERROR_UNKNOWN_HANDLE;
 	}
 
-	// TODO: This is not accurate. It's just an approximation of the real value
-	//       The real value can be obtained in TRP.cpp:
-	//		 m_headers.trp_file_size - sizeof(m_headers) - (m_headers.trp_files_count * m_headers.trp_element_size);
-	// TODO: eventually this should be set to 0 when trophys are detected as already installed, setting to 0 now causes some games to not call registerContext, which leads to trophys never getting installed
-	*reqspace = ctxt->trp_stream.size();
+	if (!fs::is_dir("/dev_hdd0/home/00000001/trophy/" + ctxt->trp_name))
+	{
+		TRPLoader trp(ctxt->trp_stream);
 
+		if (trp.LoadHeader())
+		{
+			*reqspace = trp.GetRequiredSpace();
+			return CELL_OK;
+		}
+	}
+
+	*reqspace = 0;
 	return CELL_OK;
 }
 
diff --git a/rpcs3/Loader/TRP.cpp b/rpcs3/Loader/TRP.cpp
index fe43740d03..23d81c3067 100644
--- a/rpcs3/Loader/TRP.cpp
+++ b/rpcs3/Loader/TRP.cpp
@@ -103,6 +103,14 @@ bool TRPLoader::LoadHeader(bool show)
 	return true;
 }
 
+u64 TRPLoader::GetRequiredSpace() const
+{
+	const u64 file_size = m_header.trp_file_size;
+	const u64 file_element_size = u64{1} * m_header.trp_files_count * m_header.trp_element_size;
+
+	return file_size - sizeof(m_header) - file_element_size;
+}
+
 bool TRPLoader::ContainsEntry(const char *filename)
 {
 	for (const TRPEntry& entry : m_entries)
diff --git a/rpcs3/Loader/TRP.h b/rpcs3/Loader/TRP.h
index 4418e805b0..8df4a7679d 100644
--- a/rpcs3/Loader/TRP.h
+++ b/rpcs3/Loader/TRP.h
@@ -32,6 +32,7 @@ public:
 
 	bool Install(const std::string& dest, bool show = false);
 	bool LoadHeader(bool show = false);
+	u64 GetRequiredSpace() const;
 
 	bool ContainsEntry(const char *filename);
 	void RemoveEntry(const char *filename);