diff --git a/index.js b/index.js
index 241a7f7..773efc3 100644
--- a/index.js
+++ b/index.js
@@ -25,7 +25,7 @@ try {
   if (minColorRange != '' && maxColorRange != '' && valColorRange != '') {
     const max = parseFloat(maxColorRange);
     const min = parseFloat(minColorRange);
-    const val = parseFloat(valColorRange);
+    let val = parseFloat(valColorRange);
 
     if (val < min) val = min;
     if (val > max) val = max;