diff --git a/.eslintrc.json b/.eslintrc.json
index 682b97c1..9d3c5d01 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -17,6 +17,7 @@
 		"no-throw-literal": [
 			"error"
 		],
+		"no-const-assign": "error",
 		"prefer-const": [
 			"error",
 			{
diff --git a/src/three/loaders/gltf/metadata/utilities/ClassPropertyHelpers.js b/src/three/loaders/gltf/metadata/utilities/ClassPropertyHelpers.js
index fcf8401d..d52e524e 100644
--- a/src/three/loaders/gltf/metadata/utilities/ClassPropertyHelpers.js
+++ b/src/three/loaders/gltf/metadata/utilities/ClassPropertyHelpers.js
@@ -204,7 +204,7 @@ export function resolveDefaultElement( property, target = null ) {
 		if ( isMatrixType( type ) ) {
 
 			const elements = target.elements;
-			for ( const i = 0, l = elements.length; i < l; i ++ ) {
+			for ( let i = 0, l = elements.length; i < l; i ++ ) {
 
 				elements[ i ] = defaultValue[ i ];