diff --git a/src/ioslaves/help/CMakeLists.txt b/src/ioslaves/help/CMakeLists.txt
--- a/src/ioslaves/help/CMakeLists.txt
+++ b/src/ioslaves/help/CMakeLists.txt
@@ -49,7 +49,7 @@
    KF5::I18n
    KF5::Archive
    KF5::KIOCore
-   KF5::XsltKde
+   KF5::DocTools
    ${LIBXML2_LIBRARIES}
    ${LIBXSLT_LIBRARIES}
    ${LIBXSLT_EXSLT_LIBRARIES}
@@ -71,7 +71,7 @@
    KF5::I18n
    KF5::Archive
    KF5::KIOCore
-   KF5::XsltKde
+   KF5::DocTools
    ${LIBXML2_LIBRARIES}
    ${LIBXSLT_LIBRARIES}
    ${LIBXSLT_EXSLT_LIBRARIES}
diff --git a/src/ioslaves/help/kio_help.cpp b/src/ioslaves/help/kio_help.cpp
--- a/src/ioslaves/help/kio_help.cpp
+++ b/src/ioslaves/help/kio_help.cpp
@@ -22,9 +22,10 @@
 #include <config-help.h>
 
 #include "kio_help.h"
-#include "xslt.h"
 #include "xslt_help.h"
 
+#include <docbookxslt.h>
+
 #include <KLocalizedString>
 
 #include <QDebug>
@@ -225,7 +226,7 @@
 
     if (mGhelp) {
         QString xsl = QStringLiteral("customization/kde-nochunk.xsl");
-        mParsed = transform(file, locateFileInDtdResource(xsl));
+        mParsed = KDocTools::transform(file, KDocTools::locateFileInDtdResource(xsl));
 
         //qDebug() << "parsed " << mParsed.length();
 
@@ -250,7 +251,7 @@
         //qDebug() << "cached parsed " << mParsed.length();
 
         if (mParsed.isEmpty()) {
-            mParsed = transform(file, locateFileInDtdResource(QStringLiteral("customization/kde-chunk.xsl")));
+            mParsed = KDocTools::transform(file, KDocTools::locateFileInDtdResource(QStringLiteral("customization/kde-chunk.xsl")));
             if (!mParsed.isEmpty()) {
                 infoMessage(i18n("Saving to cache"));
 #ifdef Q_OS_WIN
@@ -265,8 +266,8 @@
 #else
                 QString cache = file.left(file.length() - 7);
 #endif
-                saveToCache(mParsed, QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation)
-                            + "/kio_help" + cache + "cache.bz2");
+                KDocTools::saveToCache(mParsed, QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation)
+                                       + "/kio_help" + cache + "cache.bz2");
             }
         } else {
             infoMessage(i18n("Using cached version"));
@@ -335,7 +336,7 @@
 
     QString filename = url.path().mid(url.path().lastIndexOf('/') + 1);
 
-    QByteArray result = extractFileToBuffer(mParsed, filename);
+    QByteArray result = KDocTools::extractFileToBuffer(mParsed, filename);
 
     if (result.isNull()) {
         sendError(i18n("Could not find filename %1 in %2.", filename, url.toString()));
diff --git a/src/ioslaves/help/main.cpp b/src/ioslaves/help/main.cpp
--- a/src/ioslaves/help/main.cpp
+++ b/src/ioslaves/help/main.cpp
@@ -5,7 +5,8 @@
 #endif
 
 #include "kio_help.h"
-#include "xslt.h"
+
+#include <docbookxslt.h>
 
 #include <QDebug>
 
@@ -39,7 +40,7 @@
 {
     Q_DECL_EXPORT int kdemain(int argc, char **argv)
     {
-        setupStandardDirs();
+        KDocTools::setupStandardDirs();
 
         //qDebug() << "Starting " << getpid();
 
diff --git a/src/ioslaves/help/main_ghelp.cpp b/src/ioslaves/help/main_ghelp.cpp
--- a/src/ioslaves/help/main_ghelp.cpp
+++ b/src/ioslaves/help/main_ghelp.cpp
@@ -6,7 +6,8 @@
 #endif
 
 #include "kio_help.h"
-#include "xslt.h"
+
+#include <docbookxslt.h>
 
 #include <QDebug>
 
@@ -38,7 +39,7 @@
 {
     Q_DECL_EXPORT int kdemain(int argc, char **argv)
     {
-        setupStandardDirs();
+        KDocTools::setupStandardDirs();
 
         //qDebug() << "Starting " << getpid();
 
diff --git a/src/ioslaves/help/xslt_help.cpp b/src/ioslaves/help/xslt_help.cpp
--- a/src/ioslaves/help/xslt_help.cpp
+++ b/src/ioslaves/help/xslt_help.cpp
@@ -1,5 +1,6 @@
 #include "xslt_help.h"
-#include "xslt.h"
+
+#include <docbookxslt.h>
 
 #include <libxslt/xsltconfig.h>
 #include <libxslt/xsltInternals.h>
@@ -24,7 +25,7 @@
     if (!compareTimeStamps(filename, cache)) {
         return false;
     }
-    if (!compareTimeStamps(locateFileInDtdResource(QStringLiteral("customization/kde-chunk.xsl")), cache)) {
+    if (!compareTimeStamps(KDocTools::locateFileInDtdResource(QStringLiteral("customization/kde-chunk.xsl")), cache)) {
         return false;
     }