diff --git a/cpp/ql/test/library-tests/arguments/arguments.expected b/cpp/ql/test/library-tests/arguments/arguments.expected
index 9d0d85857ef..e5120abfa92 100644
--- a/cpp/ql/test/library-tests/arguments/arguments.expected
+++ b/cpp/ql/test/library-tests/arguments/arguments.expected
@@ -15,8 +15,6 @@
 | arguments.c | 15 | --edg |
 | arguments.c | 16 | __CODEQL_TEST__ |
 | arguments.c | 17 | --gcc |
-| arguments.c | 18 | --predefined_macros |
-| arguments.c | 19 | <tools>/qltest/predefined_macros |
-| arguments.c | 20 | -w |
-| arguments.c | 21 | -Werror |
-| arguments.c | 22 | arguments.c |
+| arguments.c | 18 | -w |
+| arguments.c | 19 | -Werror |
+| arguments.c | 20 | arguments.c |
diff --git a/cpp/ql/test/library-tests/arguments/arguments.ql b/cpp/ql/test/library-tests/arguments/arguments.ql
index c631f10b876..55013be092a 100644
--- a/cpp/ql/test/library-tests/arguments/arguments.ql
+++ b/cpp/ql/test/library-tests/arguments/arguments.ql
@@ -4,8 +4,5 @@ from Compilation c, int i, string s
 // Skip the extractor name; it'll vary depending on platform
 where
   i > 0 and
-  s =
-    c.getArgument(i)
-        .replaceAll("\\", "/")
-        .regexpReplaceAll(".*(/qltest/predefined_macros)", "<tools>$1")
+  s = c.getArgument(i).replaceAll("\\", "/")
 select c.getAFileCompiled().toString(), i, s