diff --git a/clients/aurorae/themes/plastik/code/CMakeLists.txt b/clients/aurorae/themes/plastik/code/CMakeLists.txt
index 131658436c..8d3937db0f 100644
--- a/clients/aurorae/themes/plastik/code/CMakeLists.txt
+++ b/clients/aurorae/themes/plastik/code/CMakeLists.txt
@@ -4,6 +4,6 @@ set(plastik_plugin_SRCS
     )
 
 add_library(plastikplugin SHARED ${plastik_plugin_SRCS})
-target_link_libraries(plastikplugin Qt5::Core Qt5::Quick KF5::ConfigWidgets KF5::WindowSystem)
+target_link_libraries(plastikplugin Qt5::Core Qt5::Quick KF5::ConfigWidgets)
 install(TARGETS plastikplugin DESTINATION ${QML_INSTALL_DIR}/org/kde/kwin/decorations/plastik)
 install(FILES qmldir DESTINATION ${QML_INSTALL_DIR}/org/kde/kwin/decorations/plastik)
diff --git a/clients/aurorae/themes/plastik/code/plastikbutton.cpp b/clients/aurorae/themes/plastik/code/plastikbutton.cpp
index 3e42964b29..594073c821 100644
--- a/clients/aurorae/themes/plastik/code/plastikbutton.cpp
+++ b/clients/aurorae/themes/plastik/code/plastikbutton.cpp
@@ -19,7 +19,6 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 #include "plastikbutton.h"
-#include <kdecoration.h>
 #include <KColorScheme>
 #include <KConfigGroup>
 #include <KSharedConfig>
@@ -57,52 +56,52 @@ QPixmap PlastikButtonProvider::requestPixmap(const QString &id, QSize *size, con
         shadow = true;
     }
     ButtonIcon button;
-    switch (static_cast<KDecorationDefines::DecorationButton>(idParts[0].toInt())) {
-    case KDecorationDefines::DecorationButtonClose:
+    switch (static_cast<DecorationButton>(idParts[0].toInt())) {
+    case DecorationButtonClose:
         button = CloseIcon;
         break;
-    case KDecorationDefines::DecorationButtonMaximizeRestore:
+    case DecorationButtonMaximizeRestore:
         if (toggled) {
             button = MaxRestoreIcon;
         } else {
             button = MaxIcon;
         }
         break;
-    case KDecorationDefines::DecorationButtonMinimize:
+    case DecorationButtonMinimize:
         button = MinIcon;
         break;
-    case KDecorationDefines::DecorationButtonQuickHelp:
+    case DecorationButtonQuickHelp:
         button = HelpIcon;
         break;
-    case KDecorationDefines::DecorationButtonOnAllDesktops:
+    case DecorationButtonOnAllDesktops:
         if (toggled) {
             button = NotOnAllDesktopsIcon;
         } else {
             button = OnAllDesktopsIcon;
         }
         break;
-    case KDecorationDefines::DecorationButtonKeepAbove:
+    case DecorationButtonKeepAbove:
         if (toggled) {
             button = NoKeepAboveIcon;
         } else {
             button = KeepAboveIcon;
         }
         break;
-    case KDecorationDefines::DecorationButtonKeepBelow:
+    case DecorationButtonKeepBelow:
         if (toggled) {
             button = NoKeepBelowIcon;
         } else {
             button = KeepBelowIcon;
         }
         break;
-    case KDecorationDefines::DecorationButtonShade:
+    case DecorationButtonShade:
         if (toggled) {
             button = UnShadeIcon;
         } else {
             button = ShadeIcon;
         }
         break;
-    case KDecorationDefines::DecorationButtonApplicationMenu:
+    case DecorationButtonApplicationMenu:
         button = AppMenuIcon;
         break;
     default:
diff --git a/clients/aurorae/themes/plastik/code/plastikbutton.h b/clients/aurorae/themes/plastik/code/plastikbutton.h
index 81a656a27e..1e59cb60b9 100644
--- a/clients/aurorae/themes/plastik/code/plastikbutton.h
+++ b/clients/aurorae/themes/plastik/code/plastikbutton.h
@@ -52,6 +52,29 @@ private:
         DiagonalLine,
         CrossDiagonalLine
     };
+    enum DecorationButton {
+        /**
+         * Invalid button value. A decoration should not create a button for
+         * this type.
+         */
+        DecorationButtonNone,
+        DecorationButtonMenu,
+        DecorationButtonApplicationMenu,
+        DecorationButtonOnAllDesktops,
+        DecorationButtonQuickHelp,
+        DecorationButtonMinimize,
+        DecorationButtonMaximizeRestore,
+        DecorationButtonClose,
+        DecorationButtonKeepAbove,
+        DecorationButtonKeepBelow,
+        DecorationButtonShade,
+        DecorationButtonResize,
+        /**
+         * The decoration should create an empty spacer instead of a button for
+         * this type.
+         */
+        DecorationButtonExplicitSpacer
+    };
     QPixmap icon(ButtonIcon icon, int size, bool active, bool shadow);
     void drawObject(QPainter &p, Object object, int x, int y, int length, int lineWidth);
 };