diff --git a/include/scalfmm/operators/fmm_operators.hpp b/include/scalfmm/operators/fmm_operators.hpp
index e22ae01700cfd81ccd94451c7d4723a4d2f882c5..0887000044948a4825564155a5785917b0325b04 100644
--- a/include/scalfmm/operators/fmm_operators.hpp
+++ b/include/scalfmm/operators/fmm_operators.hpp
@@ -8,6 +8,8 @@
 #include <cstdlib>
 #include <iostream>
 
+#include <cpp_tools/colors/colorized.hpp>
+
 namespace scalfmm::operators
 {
     /**