diff --git a/test-cargo-miri/run-test.py b/test-cargo-miri/run-test.py
index 60924d4f8dd..8edd947c3b0 100755
--- a/test-cargo-miri/run-test.py
+++ b/test-cargo-miri/run-test.py
@@ -102,7 +102,7 @@ def test_cargo_miri_test():
     )
     test("`cargo miri test` (subcrate, no isolation)",
         cargo_miri("test") + ["-p", "subcrate"],
-        "test.subcrate.stdout.ref", "test.stderr-empty.ref",
+        "test.subcrate.stdout.ref", "test.stderr-proc-macro.ref",
         env={'MIRIFLAGS': "-Zmiri-disable-isolation"},
     )
 
diff --git a/test-cargo-miri/subcrate/Cargo.toml b/test-cargo-miri/subcrate/Cargo.toml
index be27f88ad9a..ea2936d52a0 100644
--- a/test-cargo-miri/subcrate/Cargo.toml
+++ b/test-cargo-miri/subcrate/Cargo.toml
@@ -4,6 +4,10 @@ version = "0.1.0"
 authors = ["Miri Team"]
 edition = "2018"
 
+[lib]
+proc-macro = true
+doctest = false
+
 [[bin]]
 name = "subcrate"
 path = "main.rs"
diff --git a/test-cargo-miri/subcrate/src/lib.rs b/test-cargo-miri/subcrate/src/lib.rs
new file mode 100644
index 00000000000..706e368017c
--- /dev/null
+++ b/test-cargo-miri/subcrate/src/lib.rs
@@ -0,0 +1,2 @@
+#[cfg(test)]
+compile_error!("Miri should not touch me");
diff --git a/test-cargo-miri/test.stderr-proc-macro.ref b/test-cargo-miri/test.stderr-proc-macro.ref
new file mode 100644
index 00000000000..4983250917b
--- /dev/null
+++ b/test-cargo-miri/test.stderr-proc-macro.ref
@@ -0,0 +1 @@
+Running unit tests of `proc-macro` crates is not currently supported by Miri.