diff --git a/compiler/gengo/emit_stmt.go b/compiler/gengo/emit_stmt.go
index 009d829..8252805 100644
--- a/compiler/gengo/emit_stmt.go
+++ b/compiler/gengo/emit_stmt.go
@@ -461,11 +461,12 @@ func (g *Generator) emitAssign(a *ast.AssignExpr, locals localMap) {
 		g.emitExpr(a.Right)
 		g.emitBinaryOp(a.Op)
 		// Stack now: [folded value]. Re-push X/index to set.
-		g.writeln("_v := t.Pop2()")
+		// Scope _v so multiple compound assigns in the same function don't redeclare.
+		g.writeln("{ _v := t.Pop2()")
 		g.emitExpr(idx.X)
 		g.emitExpr(idx.Index)
 		g.writeln("t.PushValue(_v)")
-		g.writeln("t.ArrayPop()")
+		g.writeln("t.ArrayPop() }")
 		return
 	}