diff --git a/src/util/BitField.js b/src/util/BitField.js
index ec1f8dc09..4d03aa6a5 100644
--- a/src/util/BitField.js
+++ b/src/util/BitField.js
@@ -147,7 +147,9 @@ class BitField {
     if (bit instanceof BitField) return bit.bitfield;
     if (Array.isArray(bit)) return bit.map(p => this.resolve(p)).reduce((prev, p) => prev | p, 0);
     if (typeof bit === 'string' && typeof this.FLAGS[bit] !== 'undefined') return this.FLAGS[bit];
-    throw new RangeError('BITFIELD_INVALID');
+    const error = new RangeError('BITFIELD_INVALID');
+    error.bit = bit;
+    throw error;
   }
 }