--- a/tlshmodule.cpp
+++ b/tlshmodule.cpp
@@ -59,7 +59,7 @@
 #include <Python.h>
 #include <new>
 #include <bytesobject.h>
-#include "tlsh.h"
+#include <tlsh/tlsh.h>

 // to generate the "T1" hashes introduced in TLSH 4.0.0
 // see 4.0.0 from 26/Mar/2020 at https://github.com/trendmicro/tlsh/blob/master/Change_History.md