diff --git a/internal/lsp/protocol/basic.go b/internal/lsp/protocol/basic.go
index 0dd2f5e4..a8bd96ce 100644
--- a/internal/lsp/protocol/basic.go
+++ b/internal/lsp/protocol/basic.go
@@ -106,7 +106,7 @@ type Diagnostic struct {
 	/**
 	 * The diagnostic's code, which might appear in the user interface.
 	 */
-	Code string `json:"code,omitempty"` // number | string
+	Code interface{} `json:"code,omitempty"` // number | string
 
 	/**
 	 * A human-readable string describing the source of this