diff --git a/parser/src/cfg/tests.rs b/parser/src/cfg/tests.rs
index 814c78038..e6a1458b1 100644
--- a/parser/src/cfg/tests.rs
+++ b/parser/src/cfg/tests.rs
@@ -556,7 +556,8 @@ fn test_include_bad2_has_original_filename() {
 }
 
 #[test]
-fn parse_submacro() {
+fn parse_bad_submacro() {
+    // Test exists since it used to crash. It should not crash.
     let _lk = match CFG_PARSE_LOCK.lock() {
         Ok(guard) => guard,
         Err(poisoned) => poisoned.into_inner(),
@@ -565,7 +566,7 @@ fn parse_submacro() {
     let source = r#"
 (defsrc a)
 (deflayer base
-  (macro M-S-())
+  (macro M-s-())
 )
 "#;
     parse_cfg_raw_string(source, &mut s, "test")
@@ -576,6 +577,29 @@ fn parse_submacro() {
         .unwrap_err();
 }
 
+#[test]
+fn parse_bad_submacro_2() {
+    // Test exists since it used to crash. It should not crash.
+    let _lk = match CFG_PARSE_LOCK.lock() {
+        Ok(guard) => guard,
+        Err(poisoned) => poisoned.into_inner(),
+    };
+    let mut s = ParsedState::default();
+    let source = r#"
+(defsrc a)
+(deflayer base
+  (macro M-s-g)
+)
+"#;
+    parse_cfg_raw_string(source, &mut s, "test")
+        .map_err(|e| {
+            eprintln!("{:?}", error_with_source(e));
+            ""
+        })
+        .unwrap_err();
+}
+
+
 #[test]
 fn parse_switch() {
     let _lk = match CFG_PARSE_LOCK.lock() {