diff --git a/test/val/bug1431.c b/test/val/bug1431.c
new file mode 100644
index 000000000..9eae3bdbd
--- /dev/null
+++ b/test/val/bug1431.c
@@ -0,0 +1,33 @@
+/*
+$ cl65 -Osir --codesize 180 -S -o main.s main.c
+main.c(9): Internal compiler error:
+Code generation messed up: StackPtr is -2, should be -4
+
+Input: if (wcnt > btw) {
+
+$ git bisect bad
+aa6fdf58b8a17b747090fb521f3d9106e0c56d1c is the first bad commit
+commit aa6fdf58b8a17b747090fb521f3d9106e0c56d1c
+Author: acqn <acqn163@outlook.com>
+Date:   Mon Feb 8 09:03:19 2021 +0800
+
+    Addresses in constant subtraction expressions now work.
+    Fixed codegen for cast type subtraction in constant expressions.
+*/
+
+unsigned long fptr = 0x40001;
+
+int main(void)
+{
+    unsigned int btw = 500;
+    unsigned int wcnt;
+
+    wcnt = 512U - (fptr % 512U);
+
+    if (wcnt > btw) {
+         wcnt = btw;
+    }
+
+    return wcnt == 500 ? 0 : 1;
+}
+