diff --git a/smoketest/libtest.cxx b/smoketest/libtest.cxx
index ae87c796112aa744b2249ad2e10b8d001d5720ea..b7205258cb924cc8d0403587174f2b818246d742 100644
--- a/smoketest/libtest.cxx
+++ b/smoketest/libtest.cxx
@@ -42,7 +42,7 @@
     long getTimeMS()
     {
         struct timeval t;
-        gettimeofday(&t, NULL);
+        gettimeofday(&t, nullptr);
         return t.tv_sec*1000 + t.tv_usec/1000;
     }
 
@@ -111,7 +111,7 @@ int main (int argc, char **argv)
 
     if( argc > 3 )
     {
-        const char *pFilter = NULL;
+        const char *pFilter = nullptr;
         if( argc > 4 )
             pFilter = argv[4];
         fprintf( stderr, "save document as '%s' (%s)\n", argv[3], pFilter ? pFilter : "<null>" );
diff --git a/smoketest/smoketest.cxx b/smoketest/smoketest.cxx
index 8b070989d4d2f5cfa006bf08fd02944833bad4ba..c4c2178066e1d30847e652c916c85cac9f5eb2ae 100644
--- a/smoketest/smoketest.cxx
+++ b/smoketest/smoketest.cxx
@@ -65,7 +65,7 @@ class Listener:
     public cppu::WeakImplHelper< css::frame::XDispatchResultListener >
 {
 public:
-    explicit Listener(Result * result): result_(result) { OSL_ASSERT(result != 0); }
+    explicit Listener(Result * result): result_(result) { OSL_ASSERT(result != nullptr); }
 
 private:
     virtual void SAL_CALL disposing(css::lang::EventObject const &)