diff --git a/elixir-mode.el b/elixir-mode.el
index f046d542..08907960 100644
--- a/elixir-mode.el
+++ b/elixir-mode.el
@@ -235,6 +235,7 @@ for the Elixir programming language."
       ;; Finally, like other identifiers, it can be terminated with either `?'
       ;; or `!'.
       (module-names . ,(rx symbol-start
+                           (optional "%")
                            (one-or-more (any "A-Z"))
                            (zero-or-more (any "A-Z" "a-z" "_" "0-9"))
                            (zero-or-more
diff --git a/test/elixir-mode-font-test.el b/test/elixir-mode-font-test.el
index b8f248ed..0b86cae6 100644
--- a/test/elixir-mode-font-test.el
+++ b/test/elixir-mode-font-test.el
@@ -44,7 +44,8 @@ buffer."
   (elixir-test-with-temp-buffer
    "defmodule Application.Behavior do
   use Application.Behaviour
-  Stand.Alone.call"
+  Stand.Alone.call
+  %RuntimeError{message: msg}"
    (should (eq (elixir-test-face-at 1) 'font-lock-keyword-face))
    (should (eq (elixir-test-face-at 11) 'font-lock-type-face))
    (should (eq (elixir-test-face-at 22) 'font-lock-type-face))
@@ -57,7 +58,10 @@ buffer."
    (should (eq (elixir-test-face-at 68) 'font-lock-type-face))
    (should (eq (elixir-test-face-at 72) 'font-lock-type-face))
    ;; no face for function call
-   (should (eq (elixir-test-face-at 79) nil))))
+   (should (eq (elixir-test-face-at 79) nil))
+   (should (eq (elixir-test-face-at 84) 'font-lock-type-face))
+   ;; no face for curly braces
+   (should (eq (elixir-test-face-at 97) nil))))
 
 (ert-deftest elixir-mode-syntax-table/fontify-regex-with-quote ()
   "https://github.com/elixir-lang/emacs-elixir/issues/23"