diff --git a/internal/completions/httpapi/codecompletion.go b/internal/completions/httpapi/codecompletion.go
index e27bbf46516..d8fe7681473 100644
--- a/internal/completions/httpapi/codecompletion.go
+++ b/internal/completions/httpapi/codecompletion.go
@@ -32,7 +32,7 @@ func NewCodeCompletionsHandler(logger log.Logger, db database.DB) http.Handler {
 				return customModel, nil
 			}
 			if requestParams.Model != "" {
-				return "", errors.New("Unsupported chat model")
+				return "", errors.Newf("Unsupported code completion model %q", requestParams.Model)
 			}
 			return c.CompletionModel, nil
 		},