diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index 964afaefa..2485a3292 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -2813,6 +2813,13 @@ private:
               "}");
         ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (portability) Undefined behaviour, when 'i' is 123 the pointer arithmetic 'x+i' is out of bounds.\n", errout.str());
 
+        check("void f(int i) {\n"
+            "    char x[10];\n"
+            "    if (i == -1) {}\n"
+            "    dostuff(x+i);\n"
+            "}");
+        ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (portability) Undefined behaviour, when 'i' is -1 the pointer arithmetic 'x+i' is out of bounds.\n", errout.str());
+
         check("void f() {\n" // #6350 - fp when there is cast of buffer
               "  wchar_t buf[64];\n"
               "  p = (unsigned char *) buf + sizeof (buf);\n"