diff --git a/tests/webtbs/tw41079.pp b/tests/webtbs/tw41079.pp
new file mode 100644
index 0000000000..1f8871f865
--- /dev/null
+++ b/tests/webtbs/tw41079.pp
@@ -0,0 +1,24 @@
+{ %OPT=-O2 }
+program tw41079;
+var
+  A, B, C: QWord;
+  Fail: Boolean;
+begin
+  A := 140737488355327;
+  WriteLn('A                : ',BinStr(A, 64));
+  B := (A shr 47) shl 48;
+  WriteLn('(A shr 47) shl 48: ',BinStr(B, 64));
+  Fail := B <> 0;
+  C := A shr 47;
+  WriteLn('C := A shr 47    : ',BinStr(C, 64));
+  Fail := Fail or (C <> 0);
+  C := C shl 48;
+  WriteLn('C := C shl 48    : ',BinStr(C, 64));
+  Fail := Fail or (C <> 0);
+  if Fail then
+    begin
+      WriteLn('FAILED');
+      Halt(1);
+    end;
+  WriteLn('ok');
+end.