diff --git a/nac3core/irrt/irrt.cpp b/nac3core/irrt/irrt.cpp
index 722ed32d..0d069869 100644
--- a/nac3core/irrt/irrt.cpp
+++ b/nac3core/irrt/irrt.cpp
@@ -9,4 +9,3 @@
 #include "irrt/ndarray/def.hpp"
 #include "irrt/ndarray/iter.hpp"
 #include "irrt/ndarray/indexing.hpp"
-#include "irrt/string.hpp"