diff --git a/test/asm/single-union.asm b/test/asm/single-union.asm
new file mode 100644
index 00000000..16a33992
--- /dev/null
+++ b/test/asm/single-union.asm
@@ -0,0 +1,4 @@
+section "test", wram0
+union
+label:: ds 5
+endu