diff --git a/autotests/CMakeLists.txt b/autotests/CMakeLists.txt
--- a/autotests/CMakeLists.txt
+++ b/autotests/CMakeLists.txt
@@ -4,7 +4,7 @@
 
 macro(ktextwidgets_unit_tests)
    foreach(_testname ${ARGN})
-      ecm_add_test(${_testname}.cpp TEST_NAME ktextwidgets-${_testname} LINK_LIBRARIES Qt5::Test KF5::TextWidgets KF5::ConfigWidgets)
+      ecm_add_test(${_testname}.cpp TEST_NAME ktextwidgets-${_testname} LINK_LIBRARIES Qt5::Test KF5::TextWidgets KF5::ConfigWidgets KF5::I18n)
    endforeach()
 endmacro()
 
diff --git a/autotests/kpluralhandlingspinboxtest.cpp b/autotests/kpluralhandlingspinboxtest.cpp
--- a/autotests/kpluralhandlingspinboxtest.cpp
+++ b/autotests/kpluralhandlingspinboxtest.cpp
@@ -20,6 +20,8 @@
 #include "kpluralhandlingspinboxtest.h"
 #include "kpluralhandlingspinbox.h"
 
+#include <KLocalizedString>
+
 #include <QTest>
 
 QTEST_MAIN(KPluralHandlingSpinBoxTest)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -30,8 +30,8 @@
 PUBLIC
   Qt5::Widgets
   KF5::SonnetUi
-  KF5::I18n
 PRIVATE
+  KF5::I18n
   KF5::SonnetCore
   KF5::Service
   KF5::ConfigWidgets
diff --git a/src/widgets/kpluralhandlingspinbox.h b/src/widgets/kpluralhandlingspinbox.h
--- a/src/widgets/kpluralhandlingspinbox.h
+++ b/src/widgets/kpluralhandlingspinbox.h
@@ -21,9 +21,9 @@
 #define KPLURALHANDLINGSPINBOX_H
 
 #include <ktextwidgets_export.h>
-#include <KLocalizedString>
 #include <QSpinBox>
 
+class KLocalizedString;
 
 /**
  * @class KPluralHandlingSpinBox kpluralhandlingspinbox.h <KPluralHandlingSpinBox>
diff --git a/src/widgets/kpluralhandlingspinbox.cpp b/src/widgets/kpluralhandlingspinbox.cpp
--- a/src/widgets/kpluralhandlingspinbox.cpp
+++ b/src/widgets/kpluralhandlingspinbox.cpp
@@ -19,6 +19,8 @@
 
 #include "kpluralhandlingspinbox.h"
 
+#include <KLocalizedString>
+
 class Q_DECL_HIDDEN KPluralHandlingSpinBox::KPluralHandlingSpinBoxPrivate
 {
 public: