diff --git a/crates/rust-analyzer/src/conv.rs b/crates/rust-analyzer/src/conv.rs
index 220e0572a66..5596967bd93 100644
--- a/crates/rust-analyzer/src/conv.rs
+++ b/crates/rust-analyzer/src/conv.rs
@@ -343,7 +343,7 @@ impl Conv for HighlightTag {
             }
 
             HighlightTag::LITERAL_STRING => SemanticTokenType::STRING,
-            HighlightTag::LITERAL_ATTRIBUTE => "attribute".into(),
+            HighlightTag::LITERAL_ATTRIBUTE => SemanticTokenType::KEYWORD,
 
             HighlightTag::KEYWORD => SemanticTokenType::KEYWORD,
             HighlightTag::KEYWORD_UNSAFE => SemanticTokenType::KEYWORD,
diff --git a/editors/code/package.json b/editors/code/package.json
index 2a89987e842..c5f9d50ace6 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -379,6 +379,20 @@
                     "highContrast": "#BEBEBE"
                 }
             }
+        ],
+        "semanticTokenStyleDefaults": [
+            {
+                "selector": "*.mutable",
+                "light": {
+                    "fontStyle": "underline"
+                },
+                "dark": {
+                    "fontStyle": "underline"
+                },
+                "highContrast": {
+                    "fontStyle": "underline"
+                }
+            }
         ]
     }
 }