diff --git a/Core/Tools/PyFmt.cpp b/Core/Tools/PyFmt.cpp
index 3a56b7498224c0a219daaa662e2db895d66cd8d4..2298c9bc047108e3da6667b45d6febb57796d145 100644
--- a/Core/Tools/PyFmt.cpp
+++ b/Core/Tools/PyFmt.cpp
@@ -17,7 +17,6 @@
 #include "Core/Basics/Units.h" // printDegrees
 #include "Fit/TestEngine/Numeric.h"
 #include "Fit/Tools/RealLimits.h"
-#include "Fit/Tools/StringUtils.h"
 #include <iomanip>
 
 namespace pyfmt