diff --git a/src/vs/editor/common/encodedTokenAttributes.ts b/src/vs/editor/common/encodedTokenAttributes.ts
index bf144bd8a17..22ee1417e55 100644
--- a/src/vs/editor/common/encodedTokenAttributes.ts
+++ b/src/vs/editor/common/encodedTokenAttributes.ts
@@ -61,30 +61,30 @@ export const enum StandardTokenType {
  *  - B = Balanced bracket (1 bit)
  *  - F = FontStyle (4 bits)
  *  - f = foreground color (9 bits)
- *  - b = background color (9 bits)
+ *  - b = background color (8 bits)
  *
  */
 export const enum MetadataConsts {
-	LANGUAGEID_MASK /*            */ = 0b00000000000000000000000011111111,
-	TOKEN_TYPE_MASK /*            */ = 0b00000000000000000000001100000000,
-	BALANCED_BRACKETS_MASK /*     */ = 0b00000000000000000000010000000000,
-	FONT_STYLE_MASK /*            */ = 0b00000000000000000111100000000000,
-	FOREGROUND_MASK /*            */ = 0b00000000111111111000000000000000,
-	BACKGROUND_MASK /*            */ = 0b11111111000000000000000000000000,
+	LANGUAGEID_MASK /*            */ = 0b00000000_00000000_00000000_11111111,
+	TOKEN_TYPE_MASK /*            */ = 0b00000000_00000000_00000011_00000000,
+	BALANCED_BRACKETS_MASK /*     */ = 0b00000000_00000000_00000100_00000000,
+	FONT_STYLE_MASK /*            */ = 0b00000000_00000000_01111000_00000000,
+	FOREGROUND_MASK /*            */ = 0b00000000_11111111_10000000_00000000,
+	BACKGROUND_MASK /*            */ = 0b11111111_00000000_00000000_00000000,
 
-	ITALIC_MASK /*                */ = 0b00000000000000000000100000000000,
-	BOLD_MASK /*                  */ = 0b00000000000000000001000000000000,
-	UNDERLINE_MASK /*             */ = 0b00000000000000000010000000000000,
-	STRIKETHROUGH_MASK /*         */ = 0b00000000000000000100000000000000,
+	ITALIC_MASK /*                */ = 0b00000000_00000000_00001000_00000000,
+	BOLD_MASK /*                  */ = 0b00000000_00000000_00010000_00000000,
+	UNDERLINE_MASK /*             */ = 0b00000000_00000000_00100000_00000000,
+	STRIKETHROUGH_MASK /*         */ = 0b00000000_00000000_01000000_00000000,
 
 	// Semantic tokens cannot set the language id, so we can
 	// use the first 8 bits for control purposes
-	SEMANTIC_USE_ITALIC /*        */ = 0b00000000000000000000000000000001,
-	SEMANTIC_USE_BOLD /*          */ = 0b00000000000000000000000000000010,
-	SEMANTIC_USE_UNDERLINE  /*    */ = 0b00000000000000000000000000000100,
-	SEMANTIC_USE_STRIKETHROUGH /* */ = 0b00000000000000000000000000001000,
-	SEMANTIC_USE_FOREGROUND /*    */ = 0b00000000000000000000000000010000,
-	SEMANTIC_USE_BACKGROUND /*    */ = 0b00000000000000000000000000100000,
+	SEMANTIC_USE_ITALIC /*        */ = 0b00000000_00000000_00000000_00000001,
+	SEMANTIC_USE_BOLD /*          */ = 0b00000000_00000000_00000000_00000010,
+	SEMANTIC_USE_UNDERLINE  /*    */ = 0b00000000_00000000_00000000_00000100,
+	SEMANTIC_USE_STRIKETHROUGH /* */ = 0b00000000_00000000_00000000_00001000,
+	SEMANTIC_USE_FOREGROUND /*    */ = 0b00000000_00000000_00000000_00010000,
+	SEMANTIC_USE_BACKGROUND /*    */ = 0b00000000_00000000_00000000_00100000,
 
 	LANGUAGEID_OFFSET = 0,
 	TOKEN_TYPE_OFFSET = 8,