diff --git a/src/widgets/styles/qfusionstyle.cpp b/src/widgets/styles/qfusionstyle.cpp
index 33c5a01677..1267907303 100644
--- a/src/widgets/styles/qfusionstyle.cpp
+++ b/src/widgets/styles/qfusionstyle.cpp
@@ -59,6 +59,9 @@
 #include <qpixmapcache.h>
 #include <qscrollbar.h>
 #include <qspinbox.h>
+#if QT_CONFIG(abstractslider)
+#include <qabstractslider.h>
+#endif
 #include <qslider.h>
 #include <qsplitter.h>
 #include <qprogressbar.h>
diff --git a/src/widgets/styles/qstylesheetstyle.cpp b/src/widgets/styles/qstylesheetstyle.cpp
index ab4d0bcb7c..275a0550d2 100644
--- a/src/widgets/styles/qstylesheetstyle.cpp
+++ b/src/widgets/styles/qstylesheetstyle.cpp
@@ -60,6 +60,9 @@
 #include <qshareddata.h>
 #include <qtoolbutton.h>
 #include <qscrollbar.h>
+#if QT_CONFIG(abstractslider)
+#include <qabstractslider.h>
+#endif
 #include <qstring.h>
 #include <qfile.h>
 #if QT_CONFIG(checkbox)