diff --git a/test/asm/reference-undefined-sym.asm b/test/asm/reference-undefined-sym.asm
new file mode 100644
index 00000000..68c83f1e
--- /dev/null
+++ b/test/asm/reference-undefined-sym.asm
@@ -0,0 +1,4 @@
+SECTION "sec", ROM0
+	db X
+
+X = 2
diff --git a/test/asm/reference-undefined-sym.out b/test/asm/reference-undefined-sym.out
new file mode 100644
index 00000000..e55ee236
--- /dev/null
+++ b/test/asm/reference-undefined-sym.out
@@ -0,0 +1,3 @@
+ERROR: reference-undefined-sym.asm(4):
+    'X' already referenced at reference-undefined-sym.asm(2)
+error: Assembly aborted (1 errors)!