diff --git a/filesystem/VFileSystem009.cpp b/filesystem/VFileSystem009.cpp
index 28582089..f906183f 100644
--- a/filesystem/VFileSystem009.cpp
+++ b/filesystem/VFileSystem009.cpp
@@ -233,6 +233,13 @@ public:
 		return FS_FileTime( p, false );
 	}
 
+	long int GetFileModificationTime( const char *path )
+	{
+		// TODO: properly reverse-engineer this
+		FixupPath( p, path );
+		return FS_FileTime( p, false );
+	}
+
 	void FileTimeToString( char *p, int size, long int time ) override
 	{
 		const time_t curtime = time;
diff --git a/filesystem/VFileSystem009.h b/filesystem/VFileSystem009.h
index e48f4b7a..f42f2fb7 100644
--- a/filesystem/VFileSystem009.h
+++ b/filesystem/VFileSystem009.h
@@ -40,8 +40,7 @@ public:
 	virtual ~IBaseInterface() {}
 };
 
-class IVFileSystem009 : public IBaseInterface
-{
+class IVFileSystem009 : public IBaseInterface {
 public:
 	virtual void Mount() = 0; /* linkage=_ZN11IFileSystem5MountEv */
 
@@ -148,6 +147,8 @@ public:
 	virtual FileHandle_t OpenFromCacheForRead(const char *, const char *, const char *) = 0; /* linkage=_ZN11IFileSystem20OpenFromCacheForReadEPKcS1_S1_ */
 
 	virtual void AddSearchPathNoWrite(const char *, const char *) = 0; /* linkage=_ZN11IFileSystem20AddSearchPathNoWriteEPKcS1_ */
+
+	virtual long int GetFileModificationTime(const char *) = 0; /* linkage=_ZN11IFileSystem23GetFileModificationTimeEPKc */
 };
 
 #endif // VFILESYSTEM009_H