diff --git a/config-kwin.h.cmake b/config-kwin.h.cmake
index e1ff0117e2..34566c2538 100644
--- a/config-kwin.h.cmake
+++ b/config-kwin.h.cmake
@@ -6,8 +6,8 @@
 #define KWIN_CONFIG "${KWIN_NAME}rc"
 #define KWIN_VERSION_STRING "${PROJECT_VERSION}"
 #define XCB_VERSION_STRING "${XCB_VERSION}"
-#define KWIN_KILLER_BIN "${CMAKE_INSTALL_PREFIX}/${LIBEXEC_INSTALL_DIR}/kwin_killer_helper"
-#define KWIN_RULES_DIALOG_BIN "${CMAKE_INSTALL_PREFIX}/${LIBEXEC_INSTALL_DIR}/kwin_rules_dialog"
+#define KWIN_KILLER_BIN "${CMAKE_INSTALL_FULL_LIBEXECDIR}/kwin_killer_helper"
+#define KWIN_RULES_DIALOG_BIN "${CMAKE_INSTALL_FULL_LIBEXECDIR}/kwin_rules_dialog"
 #cmakedefine01 HAVE_INPUT
 #cmakedefine01 HAVE_X11_XCB
 #cmakedefine01 HAVE_DRM