diff --git a/GUI/View/Numeric/NumWidgetUtil.cpp b/GUI/View/Numeric/NumWidgetUtil.cpp
index 0be3617e5fed7ec0e70978a04305c5f4d9fc1b72..d4a845cac09ec62ab8d587b3f12bd3c42899ad4d 100644
--- a/GUI/View/Numeric/NumWidgetUtil.cpp
+++ b/GUI/View/Numeric/NumWidgetUtil.cpp
@@ -13,6 +13,7 @@
 //  ************************************************************************************************
 
 #include "GUI/View/Numeric/NumWidgetUtil.h"
+#include "GUI/Support/Type/Unit.h"
 #include "GUI/Support/Util/CustomEventFilters.h"
 #include "GUI/View/Numeric/DoubleSpinBox.h"
 #include "GUI/View/Numeric/NumberUtil.h"
diff --git a/GUI/View/Numeric/NumWidgetUtil.h b/GUI/View/Numeric/NumWidgetUtil.h
index 93bc028264f2ae53612f92dd2993c9617256b5fe..8d67139d0898da9356804eed2b11bd5f2d97815e 100644
--- a/GUI/View/Numeric/NumWidgetUtil.h
+++ b/GUI/View/Numeric/NumWidgetUtil.h
@@ -16,7 +16,6 @@
 #define BORNAGAIN_GUI_VIEW_NUMERIC_NUMWIDGETUTIL_H
 
 #include "Fit/Param/RealLimits.h"
-#include "GUI/Support/Type/Unit.h"
 #include <QCheckBox>
 #include <QFormLayout>
 #include <QSpinBox>
@@ -25,6 +24,7 @@
 class DoubleSpinBox;
 class DoubleProperty;
 class ScientificSpinBox;
+enum class Unit;
 
 namespace GUI::Util {