diff --git a/linguistic/source/gciterator.cxx b/linguistic/source/gciterator.cxx
index cefe6805ad44..9d84b09ddcf1 100644
--- a/linguistic/source/gciterator.cxx
+++ b/linguistic/source/gciterator.cxx
@@ -225,7 +225,7 @@ extern "C" void lcl_workerfunc (void * gci)
 {
     osl_setThreadName("GrammarCheckingIterator");
 
-    ((GrammarCheckingIterator*)gci)->DequeueAndCheck();
+    static_cast<GrammarCheckingIterator*>(gci)->DequeueAndCheck();
 }
 
 static lang::Locale lcl_GetPrimaryLanguageOfSentence(