diff --git a/compilerplugins/clang/store/nullptr.cxx b/compilerplugins/clang/store/nullptr.cxx
index 528bb6aac9bc..83812d0ccd49 100644
--- a/compilerplugins/clang/store/nullptr.cxx
+++ b/compilerplugins/clang/store/nullptr.cxx
@@ -42,6 +42,8 @@ public:
     bool VisitImplicitCastExpr(CastExpr const * expr);
 
 private:
+    bool isInLokIncludeFile(SourceLocation spellingLocation) const;
+
     bool isFromCIncludeFile(SourceLocation spellingLocation) const;
 
     bool isMacroBodyExpansion(SourceLocation location) const;
@@ -134,6 +136,8 @@ bool Nullptr::VisitImplicitCastExpr(CastExpr const * expr) {
                 ((!compiler.getLangOpts().CPlusPlus
                   || isInUnoIncludeFile(
                       compiler.getSourceManager().getSpellingLoc(loc))
+                  || isInLokIncludeFile(
+                      compiler.getSourceManager().getSpellingLoc(loc))
                   || isFromCIncludeFile(
                       compiler.getSourceManager().getSpellingLoc(loc)))
                  ? "NULL" : "nullptr"));
@@ -143,6 +147,11 @@ bool Nullptr::VisitImplicitCastExpr(CastExpr const * expr) {
     return true;
 }
 
+bool Nullptr::isInLokIncludeFile(SourceLocation spellingLocation) const {
+    return compiler.getSourceManager().getFilename(spellingLocation)
+        .startswith(SRCDIR "/include/LibreOfficeKit/");
+}
+
 bool Nullptr::isFromCIncludeFile(SourceLocation spellingLocation) const {
     return !compat::isInMainFile(compiler.getSourceManager(), spellingLocation)
         && (StringRef(
diff --git a/include/LibreOfficeKit/LibreOfficeKit.hxx b/include/LibreOfficeKit/LibreOfficeKit.hxx
index f506bb4ef307..303f397ef54c 100644
--- a/include/LibreOfficeKit/LibreOfficeKit.hxx
+++ b/include/LibreOfficeKit/LibreOfficeKit.hxx
@@ -47,7 +47,7 @@ public:
      * @param pFormat the format to use while exporting, when omitted, then deducted from pURL's extension
      * @param pFilterOptions options for the export filter, e.g. SkipImages.
      */
-    inline bool saveAs(const char* pUrl, const char* pFormat = nullptr, const char* pFilterOptions = nullptr)
+    inline bool saveAs(const char* pUrl, const char* pFormat = NULL, const char* pFilterOptions = NULL)
     {
         return mpDoc->pClass->saveAs(mpDoc, pUrl, pFormat, pFilterOptions) != 0;
     }
@@ -220,7 +220,7 @@ public:
      * @param pCommand uno command to be posted to the document, like ".uno:Bold"
      * @param pArguments arguments of the uno command.
      */
-    inline void postUnoCommand(const char* pCommand, const char* pArguments = nullptr, bool bNotifyWhenFinished = false)
+    inline void postUnoCommand(const char* pCommand, const char* pArguments = NULL, bool bNotifyWhenFinished = false)
     {
         mpDoc->pClass->postUnoCommand(mpDoc, pCommand, pArguments, bNotifyWhenFinished);
     }
@@ -243,7 +243,7 @@ public:
      * @param pMimeType suggests the return format, for example text/plain;charset=utf-8.
      * @param pUsedMimeType output parameter to inform about the determined format (suggested one or plain text).
      */
-    inline char* getTextSelection(const char* pMimeType, char** pUsedMimeType = nullptr)
+    inline char* getTextSelection(const char* pMimeType, char** pUsedMimeType = NULL)
     {
         return mpDoc->pClass->getTextSelection(mpDoc, pMimeType, pUsedMimeType);
     }
@@ -361,17 +361,17 @@ public:
      * @param pUrl the URL of the document to load
      * @param pFilterOptions options for the import filter, e.g. SkipImages.
      */
-    inline Document* documentLoad(const char* pUrl, const char* pFilterOptions = nullptr)
+    inline Document* documentLoad(const char* pUrl, const char* pFilterOptions = NULL)
     {
-        LibreOfficeKitDocument* pDoc = nullptr;
+        LibreOfficeKitDocument* pDoc = NULL;
 
         if (LIBREOFFICEKIT_HAS(mpThis, documentLoadWithOptions))
             pDoc = mpThis->pClass->documentLoadWithOptions(mpThis, pUrl, pFilterOptions);
         else
             pDoc = mpThis->pClass->documentLoad(mpThis, pUrl);
 
-        if (pDoc == nullptr)
-            return nullptr;
+        if (pDoc == NULL)
+            return NULL;
 
         return new Document(pDoc);
     }
@@ -405,11 +405,11 @@ public:
 };
 
 /// Factory method to create a lok::Office instance.
-inline Office* lok_cpp_init(const char* pInstallPath, const char* pUserProfilePath = nullptr)
+inline Office* lok_cpp_init(const char* pInstallPath, const char* pUserProfilePath = NULL)
 {
     LibreOfficeKit* pThis = lok_init_2(pInstallPath, pUserProfilePath);
-    if (pThis == nullptr || pThis->pClass->nSize == 0)
-        return nullptr;
+    if (pThis == NULL || pThis->pClass->nSize == 0)
+        return NULL;
     return new ::lok::Office(pThis);
 }