diff --git a/semantic/unknown_variable.invalid.mj b/semantic/unknown_variable.invalid.mj
new file mode 100644
index 0000000000000000000000000000000000000000..78e11ba3bf7aecdb74d57b65eff8863991909944
--- /dev/null
+++ b/semantic/unknown_variable.invalid.mj
@@ -0,0 +1,5 @@
+class UnknownVariable {
+  public void main(String[] args){
+    System.out.println(a);
+  }
+}