diff --git a/test/Regression/Transforms/InstCombine/2003-11-12-CastSubBug.ll b/test/Regression/Transforms/InstCombine/2003-11-12-CastSubBug.ll
new file mode 100644
index 00000000000..cd5f233336a
--- /dev/null
+++ b/test/Regression/Transforms/InstCombine/2003-11-12-CastSubBug.ll
@@ -0,0 +1,9 @@
+; llvm-as < %s | opt -instcombine | llvm-dis | grep 'to sbyte'
+
+%.Base64_1 = external constant [4 x sbyte] 
+
+ubyte %test(sbyte %X) {
+	%tmp.12 = sub sbyte %X, cast ([4 x sbyte]* %.Base64_1 to sbyte)		; <sbyte> [#uses=1]
+	%tmp.13 = cast sbyte %tmp.12 to ubyte		; <ubyte> [#uses=1]
+	ret ubyte %tmp.13
+}