diff --git a/nicsensor.sh b/nicsensor.sh
index 8b6c87f..0a54c90 100755
--- a/nicsensor.sh
+++ b/nicsensor.sh
@@ -1286,7 +1286,7 @@ detect_on_qiandaohu(){
 
 detect_on_5688m7(){
     i2c_bus=13
-    pca9641_slave=0x41
+    pca9641_slave="0x41"
     get_pca9641_control
 
     do_i2c_detect $i2c_bus 0x71 0x01 0 0