diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index be263c894ee..0734216555b 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2014-06-16  Dmitry  <dgutov@yandex.ru>
+
+	* progmodes/ruby-mode.el (ruby-font-lock-keywords): Don't fontify
+	`!' in `!~' with `font-lock-negation-char-face'.  (Bug#17732)
+
 2014-06-15  Michael Albinus  <michael.albinus@gmx.de>
 
 	* net/dbus.el (dbus-call-method): Push only non D-Bus events into
diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 74edf7a680f..3c20279600e 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -2152,7 +2152,7 @@ See `font-lock-syntax-table'.")
     (ruby-match-expression-expansion
      2 font-lock-variable-name-face t)
     ;; Negation char.
-    ("\\(?:^\\|[^[:alnum:]_]\\)\\(!+\\)[^=]"
+    ("\\(?:^\\|[^[:alnum:]_]\\)\\(!+\\)[^=~]"
      1 font-lock-negation-char-face)
     ;; Character literals.
     ;; FIXME: Support longer escape sequences.