diff --git a/vcl/source/text/ImplLayoutArgs.cxx b/vcl/source/text/ImplLayoutArgs.cxx
index 73e470ecfe0c..5801229a5d3b 100644
--- a/vcl/source/text/ImplLayoutArgs.cxx
+++ b/vcl/source/text/ImplLayoutArgs.cxx
@@ -109,7 +109,7 @@ void ImplLayoutArgs::AddFallbackRun(int nMinRunPos, int nEndRunPos, bool bRTL)
 
 bool ImplLayoutArgs::HasFallbackRun() const { return !maFallbackRuns.IsEmpty(); }
 
-static bool IsControlChar(sal_UCS4 cChar)
+static bool IsControlChar(sal_Unicode cChar)
 {
     // C0 control characters
     if ((0x0001 <= cChar) && (cChar <= 0x001F))