diff --git a/components/lazutils/lazutf16.pas b/components/lazutils/lazutf16.pas
index 7be8522b61..a1b543074f 100644
--- a/components/lazutils/lazutf16.pas
+++ b/components/lazutils/lazutf16.pas
@@ -1009,7 +1009,7 @@ begin
     InitUnicodeTables;      // Initialize only when needed.
   if u<$00C0 then begin
     // most common
-    if (u>=$0041) and (u<=$0061) then
+    if (u>=$0041) and (u<=$005A) then
       Result:=u+32
     else
       Result:=u;