diff --git a/tests/webtbs/tw41148.pp b/tests/webtbs/tw41148.pp
new file mode 100644
index 0000000000..8c068584e1
--- /dev/null
+++ b/tests/webtbs/tw41148.pp
@@ -0,0 +1,34 @@
+{ %OPT=-O3 -OoNOCONSTPROP }
+
+{ Test adding a typecast Boolean to a 64-bit integer }
+program tw41148;
+
+{$mode objfpc}
+procedure v64(out code: int32);
+var
+  v: uint64;
+  r : record
+    b: boolean;
+  end;
+begin
+  r.b := true;
+  v := uint64(High(int64)) + uint64(r.b);
+  WriteLn('     Calculated: ' , BinStr(v, 64));
+  if v <> uint64($8000000000000000) then
+    begin
+      WriteLn('FAIL - expected: 1000000000000000000000000000000000000000000000000000000000000000');      
+      code := 1;
+    end
+  else
+    code := 0;
+end;
+
+var
+  code: int32;
+
+begin
+  v64(code);
+  if code <> 0 then
+    Halt(code);
+ WriteLn('ok');
+end.