diff --git a/_demo/embed/esp32/rt/main.go b/_demo/embed/esp32/rt/main.go
index 3a2f1599..bdd98bfd 100644
--- a/_demo/embed/esp32/rt/main.go
+++ b/_demo/embed/esp32/rt/main.go
@@ -278,7 +278,7 @@ func testMultiplicationFunctions() {
 
 	// Test muldi3 - signed 64-bit multiplication
 	assertEqualInt64("muldi3", muldi3(5, 4), 20)
-	assertEqualInt64("mul极3", muldi3(-5, 4), -20)
+	assertEqualInt64("muldi3", muldi3(-5, 4), -20)
 	assertEqualInt64("muldi3", muldi3(5, -4), -20)
 
 	// Test muldf3 - double precision multiplication